Dreame

L40S Ultra

Dreame L40S Ultra

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TL;DR: Superior avoidance, great for pet hair, but poor on carpets.

Overall

#3 in

Robot Vacuums

according to Reddit Icon Reddit

Sentiment score80% positive
107
11
15

Top Pros

Top Cons

Last updated: Oct 17, 2026

Reddit Reviews

Reddit Icon1999_peugeot_406
11 months ago

I also got the l40 ultra AE, but in op’s situation, the L40s ultra is a much better option

Reddit Icon2222014
10 months ago

Just bought a Dreame L40S Ultra and a L40s Ultra AE, one for each floor of my house. So far they blow every roomba product ive had completely out of the water, However I like the AE more. The Regular Ultra (Non AE) is very finicky, its tried to eat every cord in my entire upstairs more than once and finds cords I didn't even know I had, its consider louder than the AE and the fact that it leaves its mop pads at the base is unreliable it sometimes "forgets" one or both then just throws a tantrum and shuts down, and it refusesto go under chairs or small tables that should be fairly navigable. The AE is a tank, it seems to have far superior navigation and object recognition, and the mopping is much more reliable. I did tons of research on Vacuum wars website and YouTube page and caught them on Black Friday at less than half price each.

10 months ago

Just bought a Dreame L40S Ultra and a L40s Ultra AE, one for each floor of my house. So far they blow every roomba product ive had completely out of the water, However I like the AE more. The Regular Ultra (Non AE) is very finicky, its tried to eat every cord in my entire upstairs more than once and finds cords I didn't even know I had, its consider louder than the AE and the fact that it leaves its mop pads at the base is unreliable it sometimes "forgets" one or both then just throws a tantrum and shuts down, and it refusesto go under chairs or small tables that should be fairly navigable. The AE is a tank, it seems to have far superior navigation and object recognition, and the mopping is much more reliable. I did tons of research on Vacuum wars website and YouTube page and caught them on Black Friday at less than half price each.

10 months ago

Been a huge fan of our dreame l40s ultra AE so far, 5 dogs, 1 kid, hard wood and carpet, it does it all.

10 months ago

I got it on sale for $549 on black Friday with a coupon, for that price it was impossible to beat.

Reddit IconAcacia_Sky
11 months ago

It is awesome!! ours arrived earlier than expected and has exceeded all my expectations!

11 months ago

We got the Dreame L40s Ultra Pro - the Australian version - and it rocks! I can say I walked into my living space this morning to fresh, clean, streak free floors! and at a much cheaper price than we originally thought we were going to have to spend :-D In Australia it is still 1k, but i think it's earning it's keep already and the app is really good too.

Reddit IconAvailable-Talk-7161
7 months ago

Recently purchased the Dreame L40S Pro Ultra. Had some cheap thing a few years ago, was a pile of crap. This time was close to buying the Eufy x10 pro omni or the one you suggested but chatgpt swayed me into the L40S Pro Ultra. Reviews are generally positive for both, the Pro Ultra has updated mapping technology and stronger suction than the Eufy model.

Reddit IconBenzoat_
11 months ago

Yes their is a different between the Ultra and the Pro Ultra, as far as I can tell the Pro Ultra has a better sensor suit. The L40s Ultra only has Lidar the L40s Pro Ultra has Lidar and a Kamera. I dont know why Dreame sells the Pro Ultra not in Amerika and only the rest of the world.

11 months ago

Yes their is a different between the Ultra and the Pro Ultra, as far as I can tell the Pro Ultra has a better sensor suit. The L40s Ultra only has Lidar the L40s Pro Ultra has Lidar and a Kamera. I dont know why Dreame sells the Pro Ultra not in Amerika and only the rest of the world.

Reddit Iconbrettzie
12 months ago

Most modern robot vacuums with cameras do their obstacle processing locally on the device, so they'll still avoid objects fine without internet. But you would lose app control, so you could only start cleanings from the robot itself. The L40s Ultra is a solid privacy-friendly choice. Honestly, the difference between structured light and cameras in real-world use isn't as dramatic as the marketing makes it sound - just try to avoid leaving cables and very small objects around and it'll work great.

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