Dreame L40 Ultra Gen 2 Review

Quick Verdict

The Dreame L40 Ultra Gen 2 takes an already well-regarded platform and gives it a significant power upgrade. The jump to 25,000Pa suction — among the highest of any robot vacuum on the market — is the headline, but the refinements to edge cleaning, the inclusion of the TriCut anti-tangle brush as standard, and the continued strength of Dreame’s all-in-one dock system make this a genuinely compelling high-end option. It’s not cheap, and as a very new product the long-term reliability picture is not yet fully clear. But on raw performance metrics, it challenges more expensive alternatives from Roborock and justifies serious consideration from anyone budgeting for a premium cleaner.

The Suction Headline: 25,000Pa

The most significant spec upgrade in the Gen 2 is the leap from the original L40 Ultra’s 11,000Pa to 25,000Pa — a figure that comfortably leads most of the market. To put this in context: most high-end robot vacuums from 2024 top out in the 10,000Pa–19,000Pa range. The Dreame L10s Ultra Gen 2 offers 10,000Pa; the Ecovacs Deebot X8 Pro Omni offers 18,000Pa. The L40 Ultra Gen 2 simply out-muscles most of its price competitors on raw suction.

This matters most in two scenarios: deep-pile carpet, where greater suction pulls embedded debris like sand and pet dander out of fibres more effectively, and hard floor gaps and grout lines, where high airflow ensures nothing lingers. Users comparing the Gen 2 against the original L40 Ultra and against rivals from Roborock at similar price points will find the suction advantage real and measurable, especially in homes with heavier soiling or shedding pets.

It is worth noting that suction figures are peak lab measurements and real-world performance depends on floor type, debris size, and cleaning mode. Five levels of adjustable suction (Quiet through Max+) let you dial in the appropriate power for each situation, which also helps protect battery life when maximum suction is not needed.

The TriCut Brush: Hair Tangles, Finally Solved

Included as standard on the Gen 2, the TriCut Brush is a rubber roller with integrated hair-cutting blades built into the design. As the brush rolls, it automatically slices long hairs before they can accumulate and wrap around the axle, directing them into the dustbin instead. The difference versus a standard brushroll is stark: owners of the original L40 Ultra reported being able to go months without ever needing to manually clean the brush of wrapped hair.

This addresses one of the most persistent maintenance frustrations with robot vacuums, particularly in households with long hair or shedding pets. It is the kind of feature that sounds unglamorous but makes a tangible difference to the daily ownership experience. Dreame recommends replacing the TriCut Brush every 3–6 months depending on use, which is a modest ongoing cost relative to the time saved.

Corner and Edge Cleaning

The L40 Ultra Gen 2 retains the extendable side brush and mop arm from its predecessor — one of Dreame’s most useful engineering contributions to the robot vacuum category. The side brush extends dynamically to pull debris from corners and close to baseboards, reaching approximately 4cm deeper into edges than a fixed side brush can achieve. The extendable mop arm swings similarly outward, meaning hard floor mopping extends right to the edge rather than leaving the usual dry strip along walls.

In independent testing of the original L40 Ultra, this extending mechanism was shown to recover significantly more debris from wall edges compared to fixed-brush designs. The Gen 2 carries this system forward without apparent changes, which is the right call — it worked well and didn’t need to be reinvented.

All-in-One Dock: A Known Strength

Dreame’s dock system for the L40 Ultra series is well-established at this point, and the Gen 2 inherits it without meaningful regression. The dock auto-empties the robot’s dustbin into a larger reservoir, refills the water tank, washes the spinning mop pads, and dries them with warm air after each session. Hot water mop washing ensures that mop pads themselves are not just rinsed but sanitised between uses.

The dock’s water tanks are generously sized — the clean water capacity supports multiple cleaning sessions without refilling, and Dreame claims up to 30 days of water autonomy under normal conditions. Realistically in homes with heavy mopping use, you will refill more frequently, but for average households this is genuinely close to hands-free operation.

Mopping Performance

The DuoScrub mopping system uses two spinning pads with electronically controlled water flow, allowing the level of moisture delivered to the floor to be adjusted across 32 levels in the Dreamehome app. This level of granularity is more than most people will use, but it does mean you can dial in appropriate moisture for delicate hardwood versus heavily soiled tile.

The mop pads lift 10.5mm (about 0.4 inches) above the floor when carpet is detected, which is sufficient for most medium-pile rugs but may graze the tips of high-pile or shag carpets. If your home has deep-pile rugs, it is worth setting those zones to carpet-avoid mode rather than relying purely on the lift mechanism.

Mopping performance on hard floors is strong for daily maintenance and solid for surface stains. Like most robot mops, it is not a substitute for occasional hand-mopping when dealing with heavily caked-on grime, but it reduces how often manual mopping is necessary.

Navigation and Obstacle Avoidance

The Gen 2 uses 3DAdapt technology combining LiDAR and a smart camera with 3D structured light for obstacle detection. Navigation coverage is thorough and the mapping accurate, with support for multi-room scheduling, no-go zones, and no-mop zones all manageable through the app.

Obstacle avoidance is reliable for common hazards like shoes, bags, and furniture, though the system — like most in this price range — can occasionally struggle with thin cables lying flat on the floor. The camera does use a forward-facing LED to navigate low-light areas, which helps in hallways and under-furniture spaces. The robot’s low profile assists with getting under furniture that taller competitors cannot access.

App and Ecosystem

The Dreamehome app is capable and feature-rich but comes with a steeper learning curve than some competitors. Roborock’s app in particular tends to feel more intuitive for first-time robot vacuum owners. Dreame’s app exposes a large number of options — 32 moisture levels, five suction levels, four cleaning routes, per-room preferences — which is excellent for power users but can overwhelm someone who just wants to press go.

Once configured, the app performs well, with real-time mapping, cleaning history, and direct control all available. Voice assistant integration covers Amazon Alexa, Google Home, and Apple Siri, with Matter protocol support available via OTA update.

How It Compares

The L40 Ultra Gen 2 primarily competes with the Roborock Qrevo Curv, which offers 18,500Pa suction and its own headline zero-tangle brush system, and with the Narwal Freo X Ultra, which excels at mopping specifically. For pure vacuuming power the Gen 2 leads; for mopping finesse the Narwal is hard to beat; for overall ecosystem maturity Roborock has an edge.

Within Dreame’s own lineup, potential buyers should also consider the Dreame L10s Ultra Gen 2 and the Dreame L10s Pro Ultra Heat, both of which offer strong performance at lower prices — the Gen 2 justifies its premium primarily through the suction and extended edge-cleaning advantages.

Final Thoughts

The Dreame L40 Ultra Gen 2 is a well-engineered, high-performance robot vacuum that earns its place in the premium tier. The 25,000Pa suction is not a marketing fiction — it translates to measurably better carpet deep-cleaning than most competitors. The TriCut Brush makes hair tangles a non-issue. The extending side brush and mop arm clean edges more thoroughly than fixed alternatives. And the dock system handles the maintenance cycle without requiring your involvement.

The caveats are real but manageable: it is expensive, the app takes some adjustment, and as a newly released product the long-term ownership track record is still being written. For buyers who want the highest available suction in a fully automated robot vacuum, the L40 Ultra Gen 2 is one of the strongest options currently on the market.