I tested the Eufy Omni S2 and it excels in just about everything, except this one thing

Now, there are many robot vacuum cleaners you can see and hear, but the Eufy Omni S2 is the only one you can smell — in a good way, of course.

Eufy’s previous flagship vac, the S1, was a commercial success, but since its launch in mid-2024, it feels like rivals have surpassed it in terms of vacuuming power and features.

With extending mop arms, edge-cleaning roller mops, and even object-moving robotic arms, smart vac technology has been nothing short of trailblazing, with the S1 feeling a little outdated by now.

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However, the Omni S2 is here, with a host of purported features, including a fragrance system and cleaning power that should set it ahead of the pack again. But are they enough to reclaim the crown from a market packed with rivals and innovations?

Eufy Omni S2 review: Price and availability

The Omni S2 is yours for an eye-watering $1,599.99 from Eufy.com. It’s right in the upper echelons of robot vac prices, but expect a raft of features and some forward-thinking design.

However, you’re locked into the S2’s more bespoke accessories, including the hard floor detergent for $22.99, dustbags for $18.99, and fragrance refills for $26.99 for the pack of three.

Eufy Omni S2 review: Design

Like its predecessor, the S1 Pro, the Omni S2 features a taller pedestal unit that hits 107cm in height. It looks striking, and a breath of fresh air against the wider docks that you need to squeeze into small gaps.

This UniClean station also has controls on its pedestal, letting you send the robot out to clean or return home without accessing your app or bending down to operate the vac itself. This 12-in-1 dock also packs lots of smarts, with a dirt detection system that can trigger an additional cleaning cycle, a 60°C hot water mop wash, an electrolysis system that generates ozonated water for sterilising cleaning elements and surfaces, and a 55°C hot air mop dryer, amongst other features. Finally, with regular use, you shouldn't need to touch the dock’s dustbag for 68 days.

Again, the robot vac unit is similarly designed to its older brother. Notably, both models do without the spinning LIDAR turret, creating a slimline height clearance of a few hairs short of 10cm. It’s not quite the uber-svelte 7.8cm height of the Roborock Qrevo Curv 2 Pro, but I’ll forgive it, as it packs in a roller mop, my preferred wet cleaning implement, over dual spinning pads.

This roller mop muscles in 1.5kg of downforce, which should be able to tackle persistent stains. It also has two scrapers and 32 water injectors as part of its real-time cleaning system. For reference, the Roborock Curv 2 Flow had 8, so this should practically eliminate streaking. Last but not least, the 29cm mop extends across its right side for enhanced edge coverage. This has been one of the main vac/mop features I’ve raved about, so I’m delighted to see it in the S2’s arsenal.

I should also say that the vac unit looks really impressive — underneath, you get the familiar DuoSpiral and anti‑tangle brushes, and a pair of spinning brush arms, one of which can extend to get at corners and edges. The top features a bumper and translucent cover that shows off the S2’s internals via a swirling array of lights when in action.

The S2 has an impressive laundry list of features. Firstly, the important stuff. There’s no skimping on suction, with 30,000 pa of power to play with. That’s a massive jump over the S1 Pro’s 8,000. It can also adjust suction and height for carpets up to 2 in, while being able to clear intimidating thresholds up to 1.65 in.

Plus, its 3D MatrixEye 2.0 reportedly detects over 200 obstacles, while time-of-flight (ToF) sensors are dotted across the body to map the space around it.

Last but not least, the S2 is the first-ever robot vac to incorporate an aromatherapy system, which diffuses pleasant scents as it cleans via a triangular cartridge that lasts up to 120 hours.

Eufy Omni S2 review: Performance and test results

We use standardized testing to objectively measure how robot vacs perform against rivals. These involve sprinkling 20g of Cheerios, 20g of kitty litter, and 5g of pet hair on a laminated 5x5-foot hardwood floor and low-pile carpet to determine how much the vacuum sucks up and what percentage remains. On top of that, I’ve been using the Omni S2 almost every day for 10 days.

In the tests, the S2 scored pretty solidly across the board, though I was a touch disappointed to find that it didn’t ace them. Wildly, the Omni C28, Eufy’s more affordable model, achieved better scores. In my observations, the S2 seemed to shy away from groupings of the Cheerios and was reluctant to clean all four edges consistently. Its strong fan also blew clumps of the cat hair across the testing area, so it was unable to collect more than its overall 84%.

Still, I consider the S2 to be a strong contender in my house. It vacuums really well, with enough suction to hoover up a lot of dust and debris across carpets and hardwood floors. When cleaning my office, living room, hallway, and kitchen, it needed one stop off to the dock to make a deposit, a testament to how much it’s managed to pick up. Mopping is also excellent, with enough water applied to the roller mop without streaking. It dealt with my ketchup floor art with style, without spreading the red further. It also left my kitchen and hallway areas pretty much spotless, with that clean “under-the-feet” feeling.

If there’s one area where the S2 needs a little work, it's the navigation. It can generally move confidently and quickly across areas, but the edge-cleaning never feels uniform. Particularly under overhanging kitchen cabinets, the vac would go into these tight spaces but then quickly bail out, leaving slivers of uncleaned areas here and there. It would also get into difficulties in tight spaces, using its bumpers and some trial and error to free itself. Still, it does avoid obstacles like toy cars and rogue feet fairly reliably. Roborock’s vacs have the best navigation in the business — with pinpoint excellent accuracy, they can attack rooms methodically and predictably.

They also know exactly how wide they are and how to get out of awkward nooks, and having reviewed this unit so soon after evaluating the fairly solid Qrevo 2 Pro, some enhanced wayfinding is something the S2 needs. What would be useful here is better navigation and a tweak of object recognition so it could better detect when an area was cleaned or not. Whether it’s misidentifying debris as objects to avoid (a common issue with smart recognition systems), there’s some work needed here. Hopefully, more over-the-air updates can solve some of these issues.

With regards to the aromatherapy system, it does leave my rooms smelling very pleasant — I’m a particular fan of the Citrus and Basil flavor. I do wish there was a way to crank up and down the scents, though. Sometimes the smells can be really subtle, so being able to kick the diffuser up a notch would have been useful.

Eufy Omni S2 review: App

Eufy’s app isn’t as customizable as Roborock’s bevvy of micromanagement systems, with up to dozens of adjustment levels for each variable. It’s altogether a simpler experience, with its clean and simple settings, usually three or four adjustments for the cleaning intensity, water distribution and suction power. In the back-end settings, you can adjust its drying, mop washing and emptying cycles, along with adding maps, and even seeing the predicted remaining lifespan of its refillables.

The latest 3D map update gives household objects an extra dimension that looks cool on a smartphone, even if it's just for aesthetics. It’s also fairly good at recognizing furniture types and placing them on the map, though it also confused the white door in my office for a fridge, so there’s that.

Eufy Omni S2: Verdict

The Omni S2 is generally an excellent vacuum, with strong suction to rival your Dyson Spot + Scrub - great mopping, gorgeous design, and a raft of extra features that earn it those stripes.

However, great robot vacuums aren’t just dependent on performance, but also on precise navigation. Whether it's the lack of a proper spinning LIDAR tower or general nav gremlins, the S2 fared a little lower than expected in my standardized tests, leaving a handful of edges and gaps uncleaned, which is the reason this gets 4 out of 5 stars.

Having said that, while rivals have performed better with superior navigation, these models usually have a weakness, either in the vacuuming or mopping. The S2, in both categories, fared excellently, so if you’ve got a large pad with lots of open space, it’ll work wonders for you. If you’ve got a more conservative property with lots of tight spaces and nooks, it’s best to look elsewhere, as rival models offer more consistent performance.