Reviews You Can Rely On

Dyson V12 Slim Review

With many of the outstanding features we've come to expect from a Dyson, this vacuum is designed for small maintenance cleaning around the house
gearlab tested logo
Dyson V12 Slim Review
Credit: Natalie Kafader
Price:  $650 List
  • 1
  • 2
  • 3
  • 4
  • 5
Manufacturer:   Dyson
Rachael Lamore
By Rachael Lamore ⋅ Senior Review Analyst  ⋅  June 27, 2025
Contributions From: Zora Thomas
67
OVERALL
SCORE


RANKED
#9 of 18
  • Carpet Performance - 30% 5.4
  • Hardwood Performance - 25% 8.9
  • Pet Hair - 20% 6.2
  • Ease of Use - 10% 7.6
  • Filtration - 10% 6.2
  • Battery - 5% 4.3

Our Verdict

The Dyson V12 Detect Slim is a compact, lightweight cordless vacuum built for light, everyday cleaning. It includes premium touches like a hard-floor-specific brush head, three power modes, and a range of high-quality attachments—features you'd expect from a Dyson. Its slim design makes it easy to maneuver and ideal for quick pickups on hard floors and low-pile carpets. That said, the small dustbin fills up quickly and clogs more often than others in our testing. And while its suction is stronger than most budget models, it doesn't have the muscle for deep-cleaning thicker carpets. At a $650 retail price, it's on the expensive side for a vacuum that's best suited to maintenance cleaning. If you want Dyson quality in a smaller, easier-to-handle package—and don't need deep-cleaning performance—this could be a great fit, especially if you find it on sale. It's best for those in smaller homes or apartments who want a lightweight vacuum for regular touch-ups rather than heavy-duty cleaning.
REASONS TO BUY
Lightweight
Easy on/off button
Specific floor heads
REASONS TO AVOID
Small dustbin
Troublesome maintenance
Pricey for performance
Editor's Note: This review was updated on June 27, 2025, to shift to our new testing metrics.

Our Analysis and Test Results

I loved this Dyson's accessories, including the hard surface-specific head that's great for hardwood and a mini motorized attachment perfect for upholstery.

The V12 Slim is made to help you pick up small messes without much effort due to its streamlined design. We'll go over each test and how we came to determine that from our results.
Credit: Natalie Kafader

Carpet Performance


Carpet performance is one of the most important features of a vacuum. We test it rigorously, with 1.5 cups of sand, rice, and cheerios spread over 27 square feet of carpet. The different debris sizes give us a realistic grasp of a vacuum's performance with a variety of household messes, and the large area lets us evaluate cleaning forward, backward, and lateral overlap.

Carpet Cleaning Performance (%)
ProductLow PileHigh Pile
Best9454
Average82.142.8
Dyson V12 Slim7844
Worst2435

The V12 comes with Dyson's Motorbar head, rather than the Digital Motorbar that's stocked on higher-end models. The distinction may seem minor, but there's a difference in real-world performance. With more clearance between the head and floor and lower suction, the V12 Detect doesn't achieve the perfect clean of some of Dyson's top-tier products. What's more, its small dustbin fills quickly, causing the vacuum to detect a clog and shut itself off.

dyson v12 slim - our low pile tests are designed to give you results that you would...
Our low pile tests are designed to give you results that you would see on conventional carpets lining rooms in a typical house.
Credit: Natalie Kafader

Low Pile


Over the three trials I conducted, the V12 picked up an average of 78% of the debris I laid out for it, and with a few more passes, I could have eliminated my mess completely. The problem is that I would have had to empty the dustbin to make those extra passes. By the end of the first 24-second trial, the vacuum had detected a clog and shut itself off. In fact, it wasn't exactly clogged, but chock full to the point that the debris had nowhere else to go.

Here's what happened time and time again when we ran the V12 through our cleaning tests.
Credit: Natalie Kafader

Admittedly, this testing is rigorous. It also bears mentioning that the Dyson performed well during each trial prior to clogging. But the fact is that large, tough-to-tackle messes are common in many people's lives, and the speed with which the vacuum filled up and shut itself off felt like a real flaw.

High Pile


High pile carpet, or shag, is tough terrain for cordless vacuums, and few really shine there. To put things in perspective, our best-performing cordless test subjects captured just over half of the debris we laid out for them in trials conducted identically to the low pile trial I described above.

Knowing this, the V12's 44% average sounds respectable, and it is. It felt less effective than the more premium Dysons, which have more power and a different head design that helps them create a good seal and maximize suction in deep carpets. But the capture rate of the Dyson Gen5detect, some $300 more expensive, was only six percent higher.

I found that the head articulation sometimes felt stiff, causing the brush roller to tilt up and away from the carpet surface when I wanted it to lie as flat as possible to maximize suction. It drove some Cheerios and rice deep into the weave, making it harder to clean out on a second pass. Still, regarding cordless vacuums, the V12 performed fairly well on high pile carpet.

Looking up close, you can see some rice being pushed down after a pass.
Credit: Natalie Kafader

What's the Suction Strength of the V12 Slim?
At 672 pascals, the V12 was far less powerful than the more expensive Dysons we tested. Models like the Dyson Gen5detect, which pulls 2388 pascals, set the bar for suction extremely high, and their pricing reflects that. Despite this, this machine has enough suction to vacuum very effectively, and the size of its dustbin is much more of a performance constraint than any lack of power.

Hardwood Performance


Vacuums often excel at one particular floor surface. In the case of the V12, that surface is hardwood, in large part because of the Fluffy Optic cleaner head, a feature that we've loved in other Dysons and were excited to see in this more affordable model. The laser-like beam of green LED light throws grit and detritus into sharp relief on hard surfaces.

You can see how the green light helps pick out dust and small particles.
Credit: Natalie Kafader

Cleaning Performance


When I set out a half cup of sand, rice, and Cheerios again, this time on hardwood, the specialized hard surface head made the cleanup process feel like an arcade game. It's incredibly satisfying, especially when the numbers back it up. I averaged 95% debris capture with the V12 between my two timed trials.


At the end of each trial, the dustbin was yet again full to bursting, and the vacuum had started to feel weaker. Still, Dyson's laser detection system works so well that I'd feel confident recommending this vacuum for a hardwood-floored house, though perhaps not a particularly large one.

dyson v12 slim - the high clearance of the head gate allows larger debris like...
The high clearance of the head gate allows larger debris like Cheerios to enter without getting plowed like most others we tested. An effective head that is specialized for hard surfaces usually does well in our testing.
Credit: Natalie Kafader

Edges


Edge performance is surprisingly important in terms of the overall experience of vacuuming. If you clean your whole floor, but the inch closest to each wall remains dirty, it's not going to feel very clean. Some vacuums do well with head-on vacuuming against walls and stairs, others can be run parallel. To test this metric, I sprinkled â…› cup of coffee grounds along a wall in our testing lab in two separate strips. I vacuumed one head-on, and the other parallel.

Before Testing After Testing
Before Testing photo comparison After Testing photo comparison
The V12 left edges completely clean after head-on and parallel cleaning.

On both test strips of coffee grounds, this product left no crumbs behind. This bolstered my overall impression that this vacuum would be great for small spaces like a dorm room or studio apartment, where tight spaces, a high edge-to-floor space ratio, and potentially different flooring types, but not for a large house with wide open rooms.

Because of the dustbin size, I'd still hesitate to recommend it for bigger houses, even if they are all hardwood. However, if you don't mind taking a few breaks to empty the dustbin, it could be a high-performing, lightweight, and relatively affordable option, even for larger spaces.

Pet Hair


Pet hair is one of the most difficult messes to clean up, and cordless vacuums, with their power limited by battery life and size, especially tend to struggle. However, just like the rest of us, many pet owners are attracted to the ease and maneuverability of going cordless.

To test this product's ability to deal with pet hair, I gathered 4 grams of fur from real pets (no animals were harmed in the testing of this vacuum) and worked it into the weave of both low and high pile carpets. Then, because humans lose hair, too, I did the same with 1 gram of long hair extensions. Finally, I set a timer for twelve seconds and vacuumed.

Pet Hair Cleaning Performance (%)
ProductLowHigh
Best8474
Dyson V12 Slim7557
Average73.648.3
Worst4820

The V12 did pretty well with pet hair cleanup. On low pile carpet, I was able to gather 75% of the hair I'd put down, and on high pile, I got 57%, an above-average performance.

Before Testing After Testing
Before Testing photo comparison After Testing photo comparison
The V12 did well with pet hair and left behind fewer clumps than the Levoit LVAC-200.

On both carpet types, there were clumps of pet hair left behind when my time was up and long hairs wrapped around the brush roll. This is a very common problem; despite various brush roll head technologies that promise to eliminate hair wrap, almost all vacuums struggle with it.

dyson v12 slim - long hair tangling in the brush roll is inconvenient but not...
Long hair tangling in the brush roll is inconvenient but not uncommon. On this Dyson, removing the brush roll to untangle the hair requires a tool but is otherwise straightforward.
Credit: Natalie Kafader

Filtration


To test the V12's filtration capabilities, I first turned on three air purifiers overnight in an enclosed room at our testing lab. After letting the purifiers do their thing, I took a day's worth of data on thirty minute intervals from two Dylos Laser Particle Counters, to get a good sense of the room's baseline. Then I poured â…“ cup of flour on the floor. Flour is a great substrate for this test because it's composed of particles of many different sizes, from less than 1 micron to over 100 microns. Pet dander, household dust, pollen, and mold also fall within this range, so we can see how well a vacuum can filter them.

Filtration Particle Count
 Dyson V12 Slim
Small Particle Count67
HEPA Filter
Dylos Air Quality DesignationExcellent

I vacuumed the flour for 30 seconds and recorded the Dylos's peak counts of both small (0.5 to 2.5 microns) and large (>2.5 microns) particles. This product's HEPA filter performed excellently, and there was no significant increase in airborne particulates from the room's baseline. Dylos designates that any reading below 75 particles is excellent air quality for small particle filtration. Small particles are more hazardous than larger particles because they can enter your bloodstream, causing chronic problems. This makes the V12 Detect Slim a great option for anyone sensitive to allergens.

Ease of Use


Vacuuming is a chore, but it can feel a lot less like one if the vacuum is easy to use and maintain. This vacuum has certain features that I love, like the specialized hardwood floor head and the mini motorized roller attachment. But it was also difficult to disassemble, empty, and clean, and the tiny dustbin meant that this process was necessary more often than it is on other vacuums.

Credit: Natalie Kafader

I also found the dustbin really difficult to detach from the vacuum's head. Multiple coworkers tried and were similarly frustrated. It's possible that this was a manufacturing defect with the specific vacuum we bought, but it certainly didn't inspire confidence.


Despite this, the V12 was light and maneuverable, and during the vacuuming process I appreciated that it was easier to move around than other Dysons I've tested. I also loved that Dyson has finally upgraded to an on/off button! The trigger activation on previous models was genuinely tiring for my hands, and the button completely solves that problem.

Maneuverability


To assess maneuverability, I set up an obstacle course where each vacuum must negotiate hardwood, carpet, bamboo mats, cone lines, and a table, chairs, and couch. This vacuum transitioned easily between the floor types, but I found that when I was swiveling the cleaning head, it didn't articulate easily. It would pick up off the floor rather than lying flat, reducing the suction power and forcing me to correct its angle manually. Zig-zagging the cleaning head through the cones required a little muscle, but all in all, the V12 was easy to steer and cornered well. Its light weight also made getting under couches and tables easier.

Maintenance


I knew this vacuum would struggle in the maintenance category as soon as I started my carpet testing. The dustbin is very small and very difficult to detach and empty. The fact that the vacuum displays a 'clogged' message and shuts itself off when it reaches capacity is a feature, not a bug; it prevents the vacuum from overheating and deteriorating. But it still feels frustrating when it happens mid-clean.

dyson v12 slim - the v12's tiny dustbin necessitates frequent cleaning.
The V12's tiny dustbin necessitates frequent cleaning.
Credit: Natalie Kafader

The maintenance of the filter and cleaning heads is more user-friendly. The filter twists easily off the top of the vacuum, and a pull tab releases the fluffy roller. A coin, flathead screwdriver, butter knife, or other flat implement is needed to release the brush roller, but other than the need for a tool, the cleaning process is straightforward and easy.

Uphostery & Attachments


For my upholstery test, I used the Hair Screw tool, which is a small motorized cleaning head. I sprinkled 1/16 cup of coffee grounds across a pillow and the same amount across an ironing board. The hair screw attachment excelled on both surfaces, and though the movement of the motorized roller blew a few coffee grounds around, it left the pillow and the ironing board completely clean. I think this attachment would be great for removing pet hair from furniture.

dyson v12 slim - the two different floor heads help you clean better than a single...
The two different floor heads help you clean better than a single roller trying to do it all. The mini motorized attachment is great for smaller areas around the house like the couch or pet beds.
Credit: Natalie Kafader

The attachments are one of the highlights of this vacuum. I heavily depended on the mini motorized brush and hard surface roller, which felt built-to-purpose and significantly increased the quality of the clean I was able to achieve on the surfaces they intended for. The V12 also came with a crevice tool and a combination tool, both relatively standard but good quality, and a wand clip to secure the attachments to the vacuum wand.

The specificity of the V12's attachments massively upgrades the vacuum. Particularly if you're going to be focusing on upholstery or hard floors, this vacuum might be a worthwhile buy just for the attachments.

Battery


Like most cordless vacuums, this vacuum's battery isn't particularly long-lived. I got 36 minutes of run time on low mode and just 7.5 minutes on high. A caveat to these numbers is that, though less powerful than other Dysons, the V12's low (or 'eco') setting still provides a lot of suction, so you shouldn't need to use the high (or 'boost') setting all that often. It also has an auto mode, which detects the level of suction necessary and adjusts the vacuum accordingly, ostensibly providing the longest possible battery life.

Measured Battery Runtime
ProductLowHigh
Best689
Average44.111.9
Dyson V12 Slim368
Worst2911

The V12's battery life isn't a problem in and of itself, particularly if you're willing to split your cleaning into a couple of separate blocks. But between charging breaks and emptying the dustbin, cleaning a full-sized house with this vacuum is going to entail a lot of interruptions.

dyson v12 slim - because this model is slim, it doesn't have a big enough battery...
Because this model is slim, it doesn't have a big enough battery bank for large houses.
Credit: Natalie Kafader

Should You Buy the Dyson V8?


I won't sugarcoat it: I would only buy the Dyson V12 Detect Slim on sale or if I want it to tackle light cleaning. If I spent $650, I'd be frustrated by the low battery life, the finicky maintenance, and the tiny dustbin. But, if I spent $400, that frustration would mostly be eclipsed by my delight at the Fluffy Optic cleaner head and the motorized hair screw. If you're cleaning a small space, particularly one with a lot of hardwood, it could be a great pick.

What Other Stick Vacuums Should You Consider?


If you love the build quality and high-tech attachments Dyson provides, but if you're craving more power, the Dyson V15 Detect is a big boost. The Shark Stratos Cordless, meanwhile, doesn't come with Dyson's slick accessories but outperformed the V12 across the board and retails for $150 less.

Compare to Similar Products

 
dyson v12 slim
This Product
Dyson V12 Slim
Awards  Editors' Choice Award
Best Performance at a Premium Price
Editors' Choice Award
Best for Most People
Top Pick Award
Best Cordless Vacuum for Allergies
Best Buy Award
Best on a Budget
Price $650 List
$599.99 at Amazon
$800 List
$940.00 at Amazon
$550 List
$430.00 at Amazon
$700 List
$625.00 at Amazon
$210 List
$169.99 at Amazon
Overall Score Sort Icon
67
80
77
71
64
Star Rating
  • 1
  • 2
  • 3
  • 4
  • 5
  • 1
  • 2
  • 3
  • 4
  • 5
  • 1
  • 2
  • 3
  • 4
  • 5
  • 1
  • 2
  • 3
  • 4
  • 5
  • 1
  • 2
  • 3
  • 4
  • 5
Bottom Line As long as you stick to minor spills, this vacuum can do the jobThe stick vacuum showcases great performance but at a high costOffering the convenience and cleanliness of an empty station and powerful cleaning performance, this vacuum sets a high bar for the competitionThis stick vacuum is unlike any other thanks to its useful and attractive docking station, but it might not be for everyoneThis vacuum delivers an impressive clean for a budget-friendly model, holding its own against competitors that cost two or even three times as much
Rating Categories Dyson V12 Slim Dyson Gen5detect Shark PowerDetect C... Samsung Bespoke Jet Smoture VAC01
Carpet Performance (30%)
5.4
7.6
7.6
7.3
6.4
Hardwood Performance (25%)
8.9
9.3
8.2
7.6
6.9
Pet Hair (20%)
6.2
7.8
7.7
5.3
5.0
Ease of Use (10%)
7.6
6.4
8.0
7.2
7.8
Filtration (10%)
6.2
8.0
7.7
9.0
7.2
Battery (5%)
4.3
7.5
6.0
6.5
5.8
Specifications Dyson V12 Slim Dyson Gen5detect Shark PowerDetect C... Samsung Bespoke Jet Smoture VAC01
Max Mode Runtime 8 min 7 min 12 min 10 min 14 min
Low Mode Runtime 36 min 67 min 47 min 54 min 43 min
Storage Wall mount Wall mount Docking station Docking station Standalone
Handheld Weight 3.3 lbs 5.0 lbs 3.9 lbs 3.2 lbs 3.5 lbs
Suction 672 Pa 2388 Pa 373 Pa 1194 Pa 249 Pa
Low Pile Cleaned 78% 96% 94% 94% 87%
High Pile Cleaned 44% 50% 54% 47% 42%
Hardwood Cleaned 95% 99% 97% 95% 85%
Pet Hair Cleaned 66% 76% 79% 54% 54%
Charge Time 2.7 hrs 3.5 hrs 4.7 hrs 2.4 hrs 4.1 hrs
Dustbin Capacity 0.3 L 0.8 L 0.7 L 0.5 L 1.5 L
Noise Level 84 dBA 77 dBA 79 dBA 77 dBA 80 dBA
Trigger No No No No No
Variable Suction Control Yes, automatic Yes, automatic Yes, automatic Yes No
Model Number V12 Detect Slim Gen5detect IP3251 VS20A9580VB /VS20A9580VB/AA VAC01

Rachael Lamore and Zora Thomas