Is the Dreame L40 Ultra Gen 2 Worth Buying?
The Dreame L40 Ultra Gen 2 is worth buying at its $569.99 sale price for mostly hard floors with some carpet, and it is a poor pick for pet owners or cluttered floors. At The Bot Scout, we have not tested this robot, so every spec here is Dreame's published claim and every test number is a result reported by Vacuum Wars. The two are set side by side below. Vacuum Wars measured a combined mop score of 38.2 against a group average of 28.5. In Vacuum Wars' embedded-sand carpet test it scored 90%, above the 82.2% average.
The weak results are hair and clutter. Vacuum Wars recorded a 67% tangle rate on 7-inch hair, where lower is better and the group average is 26%. The robot avoided only 2 of 24 obstacles in Vacuum Wars' tests, against a group average of 16.
For homes with pets, Vacuum Wars recommends the Dreame L40s Ultra instead. Vacuum Wars points buyers who rank obstacle avoidance first to the L40s Ultra AE.
Price decides the rest of the verdict. At the $799.99 regular price on Dreame's store, the case for the L40 Ultra Gen 2 weakens, and at the $569.99 sale price it is a competitive mid-range robot vacuum-mop.
What Dreame Says the L40 Ultra Gen 2 Does
Dreame rates the L40 Ultra Gen 2 at 25,000 Pascals (Pa) of suction from a 6th-generation TurboForce motor it brands Vormax, and that figure carries an asterisk on Dreame's product page. Dreame's marketing graphics also claim "100% particle pickup" and "99% hair removal", with no test conditions given on the page.
The rest of Dreame's spec sheet covers mopping, edge reach, carpet protection, the dock, the battery and navigation. Each claim below is Dreame's own.
- Mopping: the DuoScrub system uses two high-speed rotary mops with 32 levels of mop moisture adjustment, so you can set pad wetness in 32 steps.
- Edge reach: an auto-extending side brush, plus a MopExtend pad that extends up to 1.57 inches (4 centimeters) while mopping, so the mop pad reaches closer to edges.
- Carpet protection: the mops lift 0.41 inches (10.5 millimeters), which Dreame says keeps carpets dry.
- Dock: the all-in-one PowerDock washes the mops, empties dust, and hot-air dries the pads on its AceClean DryBoard.
- Dust capacity: a 3.2-liter (L) dust bag holds up to 100 days of auto-empty, according to Dreame.
- Battery: a 5,200 milliampere-hour (mAh) battery, which Dreame says charges 30% faster during off-peak hours, so a drained robot returns to cleaning sooner.
- Navigation: 3DAdapt obstacle avoidance uses a built-in dynamic laser, and Pathfinder navigation scans the surroundings in 360 degrees, so the robot maps a full circle around itself.
Optional Add-Ons Dreame Sells Separately
The Auto Solution Dispenser Module costs $39.99, holds 0.42 L, and adds detergent automatically.
The TriCut Brush costs $49.99, has a built-in hair-cutting blade, and is listed by Dreame as compatible with the L40 Ultra Gen 2 as a separate purchase. No bench result here covers the TriCut Brush, so there is no measured evidence here that it fixes the 67% hair tangle result.
Vacuum Wars Bench Results for the Dreame L40 Ultra Gen 2
Vacuum Wars' bench tests put the Dreame L40 Ultra Gen 2 above its test-group average on carpet, mopping, navigation and coverage, and below average on hair and obstacles. Vacuum Wars gives the robot 3.11 stars overall.
Vacuum Wars measured 0.79 kilopascals (kPa) with 16 cubic feet per minute (CFM) of airflow on its bench, while Dreame claims 25,000 Pa, marked with an asterisk on its product page. Neither figure is converted or ranked here.
Vacuum Wars measured 90% on its embedded-sand carpet test, above the 82.2% group average, and the sibling L40s Ultra scored 92%.
Vacuum Wars reported a combined mop score of 38.2, above the 28.5 group average, and describes the mopping as above average.
Vacuum Wars measured navigation efficiency of 0.84 square meters per minute (m²/min), above the 0.72 group average. Vacuum Wars estimates 1,290 square feet per charge, which is 120 square feet more than the 1,170 group average.
Vacuum Wars recorded a water penalty of 1.1 grams, just above the 1.07-gram average, where lower is better.
| Test | L40 Ultra Gen 2 | L40s Ultra | Group Average | Source |
|---|---|---|---|---|
| Obstacle avoidance (obstacles avoided) | 2 of 24 | 7 of 24 | 16 of 24 | Vacuum Wars |
| 7-inch hair tangle (lower is better) | 67% | 0% | 26% | Vacuum Wars |
| Flattened 2.5-inch pet-hair pickup | 69% | 91% | 82% | Vacuum Wars |
| Carpet deep clean, embedded sand | 90% | 92% | 82.2% | Vacuum Wars |
| Combined mop score | 38.2 | 38.5 | 28.5 | Vacuum Wars |
| Dried-on stain (score; direction not stated by source) | 144 | Not cited | 108 | Vacuum Wars |
| Coffee-only stain (score; direction not stated by source) | 163 | Not cited | 94 | Vacuum Wars |
| Water penalty (lower is better) | 1.1 g | 1.4 g | 1.07 g | Vacuum Wars |
| Navigation efficiency | 0.84 m²/min | 0.94 m²/min | 0.72 m²/min | Vacuum Wars |
| Estimated coverage per charge | 1,290 sq ft | 1,537 sq ft | 1,170 sq ft | Vacuum Wars |
| Measured suction and airflow | 0.79 kPa, 16 CFM | Not cited | Not cited | Vacuum Wars |
| Overall rating | 3.11 stars | Not cited | Not cited | Vacuum Wars |
Hair Tangling and Obstacle Avoidance Shortfalls
Hair handling and obstacle avoidance are the two results Vacuum Wars calls major drawbacks for the L40 Ultra Gen 2. Both results sit well below the test-group average.
In Vacuum Wars' tests, the L40 Ultra Gen 2 tangled 67% on 7-inch hair against a 26% average, while the L40s Ultra tangled 0%. On flattened 2.5-inch pet hair, Vacuum Wars measured 69% pickup against an 82% average, and 91% for the L40s Ultra.
For more pet-focused picks, see our best robot vacuum for pet hair guide.
Dreame credits obstacle avoidance to 3DAdapt and a built-in dynamic laser. Vacuum Wars counted 2 avoided obstacles out of 24, against a group average of 16 and the L40s Ultra's 7.
If you buy the L40 Ultra Gen 2, clear cords, socks and toys off the floor before each run. If you cannot keep floors clear, Vacuum Wars points to the L40s Ultra AE for buyers who put obstacle avoidance first.
Price and Warranty Details for the L40 Ultra Gen 2
On October 28, 2026, Dreame's store listed the L40 Ultra Gen 2 at $569.99, down 29% from a $799.99 regular price. That is a $230 difference between Dreame's two listed prices on that date ($799.99 minus $569.99).
Vacuum Wars' page snapshot showed a $749.99 list price and $569.98 at one retailer, so the price varies by retailer and by date. Treat any price here as a store listing on a given date.
Dreame's page lists a 30-day return policy and a 3-year warranty. The same page rates the robot 4.6 from 378 reviews.
At the sale price, you pay for what Vacuum Wars' tests found: above-average mopping, a 90% embedded-sand carpet result, and dock and app automation it calls useful. At the $799.99 regular price, you pay $230 more.
Dreame L40 Ultra Gen 2 vs L40s Ultra
Vacuum Wars' results favor the L40s Ultra over the L40 Ultra Gen 2 on every shared test except water penalty. The L40s Ultra avoided 7 of 24 obstacles against 2, tangled 0% on long hair against 67%, and picked up 91% of pet hair against 69%.
The two robots score close on mopping in Vacuum Wars' tests, at 38.5 for the L40s Ultra and 38.2 for the L40 Ultra Gen 2. Vacuum Wars also estimates the L40s Ultra covers more ground, at 1,537 square feet per charge against 1,290.
In Vacuum Wars' tests, the L40 Ultra Gen 2 wins the water penalty at 1.1 grams against 1.4 grams, where lower is better. The sources reviewed give no L40s Ultra price, so compare both at the same retailer on the day you buy.
For the rest of the lineup, see our Dreame robot vacuum guide, our Dreame X50 Ultra review and our Dreame L60 Pro Ultra review. See our Dreame company page and our Roborock vs Dreame comparison.
| Criterion | L40 Ultra Gen 2 | L40s Ultra |
|---|---|---|
| Obstacle avoidance (Vacuum Wars) | 2 of 24 | 7 of 24 |
| 7-inch hair tangle (lower is better) | 67% | 0% |
| Pet-hair pickup | 69% | 91% |
| Combined mop score | 38.2 | 38.5 |
| Water penalty (lower is better) | 1.1 g | 1.4 g |
| Verdict | Pick for mostly hard floors without long-haired pets, at the sale price | Pick for pet homes, per Vacuum Wars' recommendation |
Who Should Buy the L40 Ultra Gen 2
The Dreame L40 Ultra Gen 2 fits a home with mostly hard floors, some carpet, no long-haired pets, and floors kept clear of clutter. For that home, the 38.2 mop score and 90% carpet result in Vacuum Wars' tests, plus Dreame's 0.41-inch mop lift, line up with the job.
The L40 Ultra Gen 2 is not for homes with long-haired dogs or cats. Those buyers should pick the L40s Ultra, which Vacuum Wars recommends for pet homes.
The L40 Ultra Gen 2 is also not for floors with cords, socks or toys left out, given that it avoided only 2 of 24 obstacles in Vacuum Wars' tests. Those buyers should look at the L40s Ultra AE, which Vacuum Wars names for obstacle avoidance.
Price would change this verdict. If the sale ends and the robot returns to $799.99, the case for it weakens.
Bottom Line
At the $569.99 sale price it is competitive for clear, mostly hard floors without long-haired pets. At the $799.99 regular price the case weakens, and pet homes should choose the L40s Ultra, as Vacuum Wars recommends.
Confirm the current Dreame L40 Ultra Gen 2 price and warranty terms on Dreame's official L40 Ultra Gen 2 product page.
FAQs
Is the Dreame L40 Ultra Gen 2 good for pet hair?
No, Vacuum Wars found weak pet-hair handling on the Dreame L40 Ultra Gen 2. It tangled 67% on 7-inch hair against a 26% group average and picked up 69% of flattened pet hair against an 82% average. Vacuum Wars recommends the L40s Ultra for homes with pets, and that model tangled 0%.
How strong is the Dreame L40 Ultra Gen 2 suction?
Dreame rates the L40 Ultra Gen 2 at 25,000 Pa of suction, marked with an asterisk on its product page. Vacuum Wars measured 0.79 kPa with 16 cubic feet per minute of airflow. Neither figure is converted or ranked here. On carpet, Vacuum Wars recorded 90% pickup of embedded sand against an 82.2% average.
Does the Dreame L40 Ultra Gen 2 avoid obstacles?
Poorly, according to Vacuum Wars, which counted 2 obstacles avoided out of 24 against a group average of 16. Dreame credits avoidance to its 3DAdapt system and a built-in dynamic laser. Clear cords, socks and toys before each run, or follow Vacuum Wars' pointer to the L40s Ultra AE.
Does the Dreame L40 Ultra Gen 2 lift its mops on carpet?
Yes, Dreame says the mops lift 0.41 inches (10.5 millimeters) to keep carpets dry. Vacuum Wars recorded a water penalty of 1.1 grams against a 1.07-gram average, where lower is better.
What is the difference between the Dreame L40 Ultra Gen 2 and the L40s Ultra?
In Vacuum Wars' tests, the L40s Ultra beat the L40 Ultra Gen 2 on obstacle avoidance, hair tangle, pet-hair pickup, carpet cleaning, mopping, navigation and coverage per charge. The L40 Ultra Gen 2 had the lower water penalty, at 1.1 grams against 1.4 grams. Vacuum Wars recommends the L40s Ultra, especially for homes with pets.