Dreame L40s Ultra Review – The Best Value Flagship Robot Vacuum
If the Dreame X50 Ultra shows what’s possible at the high end, the Dreame L40s Ultra proves that you don’t need to spend top dollar to get flagship-level cleaning.
In fact, in multiple lab and real-world tests, the L40 Ultra outperformed even Dreame’s more expensive models — while costing significantly less.
Performance Overview
The L40s Ultra handles both hard floors and carpets with confidence.
It doesn’t just pick up visible debris — it digs deep.
In deep carpet tests, it delivered results above the industry average, reaching over 90% sand removal efficiency in some trials.
Its automatically extending side brush ensures strong corner coverage, sweeping debris that other robots leave behind.
Airflow and suction are both above average, providing a balanced blend of raw power and quiet operation.
The biggest surprise?
Despite having slightly lower listed suction than the X50 Ultra, its airflow design delivers cleaner results in fewer passes.
Battery Life and Efficiency
Battery endurance is one of the L40s Ultra’s strongest suits.
In standard mode, it runs for an impressive 194 minutes, one of the longest runtimes recorded in its price range.
It also tops efficiency charts with 2.2 minutes per 1% battery — nearly double the category average.
That translates to about 2400 sq. ft. of coverage per charge, making it perfect for large homes or open layouts.
Charging is fully automated through the smart dock, and the transition between cleaning cycles is seamless.
Mopping System
The L40s Ultra’s dual spinning mop pads deliver true scrubbing performance.
Water output is electronically controlled for precise moisture levels, ensuring even cleaning without streaks.
When it detects carpet, the pads automatically lift 10.5mm, avoiding wet spots and allowing the robot to vacuum and mop in the same run — no manual switching needed.
In stain removal tests, it performed above average, even beating Dreame’s higher-end X40 Ultra and the Bissell Crosswave in dried-stain cleaning.
For everyday spills, pet prints, or sticky spots, the L40s Ultra leaves floors spotless with minimal residue.
Self-Cleaning Dock
The L40s Ultra features a fully self-maintaining dock that’s among the most advanced in its class, taking care of almost every cleaning and maintenance task automatically.
It empties the dust bin into a sealed bag, washes the mop pads with hot water, and dries them with warm air to prevent odors or mildew. The dock also refills the clean water tank and even lets you add your own cleaning solution for deeper floor care.
Beneath the dock, a smart spinning squeegee tray continuously clears away hair and debris, keeping the system cleaner for longer.
In everyday use, maintenance is minimal—you’ll only need to top up the water and replace the dust bag roughly every couple of weeks.
Obstacle Avoidance and Navigation
Using a mix of LiDAR, structured light, and AI camera vision, the L40s Ultra ranks near the top in obstacle avoidance. It scored second overall in five new industry-standard avoidance tests.
Mapping is quick — most homes can be fully mapped in about five minutes.
Coverage is efficient and methodical, though the robot occasionally struggles with very thick or fluffy rugs.
Still, its combination of precision and coverage makes it one of the most reliable navigators in the market.
App and Smart Features
The Dreamehome app puts every aspect of cleaning at your fingertips.
You can easily create no-go zones, set room priorities, and draw virtual barriers right on the map. Live video streaming from the onboard camera lets you check in while the robot is working, while adjustable settings for suction power, water flow, and mop behavior help fine-tune performance for different surfaces.
Scheduled cleaning routines can be customized by room or time of day, giving you true hands-off convenience.
The app’s iOS version earns high praise for its smooth, intuitive interface, and the Android app offers the same functionality with only slightly lower user ratings.
Downsides and Real-World Notes
No robot is flawless, and the L40s Ultra comes with a few minor quirks worth mentioning:
The standard main brush can struggle a bit with long hair or heavy pet fur, though upgrading to Dreame’s optional Tri-Cut Brush makes a huge difference—testing shows it nearly eliminates tangles and greatly improves hair pickup.
Some owners have noticed a faint squeaking sound from the self-cleaning tray, which appears to be an isolated issue rather than a widespread fault.
In terms of mobility, it can manage thresholds up to about 22 mm, which is fine for most households but falls short of the X50’s higher climbing ability.
Overall, these are small trade-offs that don’t take away from the L40s Ultra’s excellent value and everyday performance.
Maintenance and Real-World Experience
The L40s Ultra is designed with easy maintenance in mind, making it far more convenient than earlier Dreame models.
The filter only needs a quick rinse or vacuum every few weeks to keep suction strong, while the mop pads attach magnetically for effortless removal and can be automatically washed in the dock when needed.
Both the dock’s sink and onboard sensors are removable, so a quick rinse now and then is all it takes to keep everything running smoothly.
In everyday use, the L40 Ultra is quiet, efficient, and remarkably self-sufficient — a true set-and-forget appliance that quietly keeps your floors spotless.
Final Verdict
The Dreame L40s Ultra combines high-end performance, top-tier navigation, and outstanding battery efficiency at a very competitive price.
Add the Tri-Cut brush for pet owners, and you’re getting near-flagship results for much less money.
If the X50 Ultra is the “no compromise” model, the L40s Ultra is the one that makes the most sense for real homes.
Rating: 4.7 / 5
Best for: Pet owners, families, and large homes
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