It enables home assistant integration too. Now my vacuum automatically starts cleaning when all family members leave home and returns to dock when we come back. You can also change the voice prompts to your liking. I found this Terminator voice [github.com] which says 'I'll be back to charge' in arnie's voice

Quality wise, they are decent robots and have been going on for multiple years for me. Compatible accessories (brushes, filters etc) are available on temu/aliexpress for very cheap.
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On papers it's better than the L40 but in testing it seems that the L40 is better although that might be due to software updates?
My house has only one dog that does not shed so I cannot speak to extreme cases where there will be lots of pet hair etc.
The app is really easy to use. It creates a map of your home and you can easily set up virtual borders to delineate different rooms and rugs. There are numerous options for cleaning, I have mine set to detach nop pads when cleaning carpet. It reattaches them to go over the hard floors.
We don't have any pets so no comments on how well it does with pet hair or avoiding pet messes but supposedly the camera can detect and avoid such things. My wife has long hair, so does my daughter and it doesn't really get tangled. In the year we've had it I've cleaned the roller maybe twice.
I've had some other non auto empty robots in the past and wouldn't do that again after having this guy.
RoboRock stopped supplying Xiaomi since 2021 while Dreame is still contracting for Xiaomi till now.
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A fair comparison is the RoboRock QRevo Pro (will be 599$ on BlackFriday) vs L20 Ultra. They are the same level of features except that roborock pro features warm water mop washing but hey, Dreame L20 is 30$ cheaper;
On a side note, RoboRock is a much more established brand here in the states, it is better than Dreame on overall innovation, quality, market share, customer support and accessories availability. Dreame is just coming in, it will take some time for them to build the services network.
RoboRock stopped supplying Xiaomi since 2021 while Dreame is still contracting for Xiaomi till now.
Although the companies are separate entities, it looks like Xiaomi is a major investor in both (and I suspect a lot of control) and as you said both companies supply white label for Xiaomi.
Roborock says: In September 2014, we received the investment from Xiaomi and became a member enterprise of Xiaomi ecological chain.
Dreame: In late 2017, Dreame became part of the Xiaomi Ecological Chain
Funny that they use the exact same wording to describe the relationship.
UPDATE: 12/6/24 - Very happy with the L20 Ultra. This unit works better than I expected. Only criticism is the app is not intuitive. App has all the right features, but takes some time (and a bit of trial & error) to customize the map to do exactly as you wish for each room. For instance, I don't want the robot to carry mop pads during vacuum tasks. I found that partitioning a floor into individual rooms works best, as carpeted rooms can then be set to vacuum only. Also love the feature of prioritizing room order. This way, if scheduling a full house (floor level) cleaning, the hardwood/tile rooms get done last and final task is mopping, where robot returns to base to wet & pickup pads. Important to note, this will prevent wasted soap, which reduces cost of consumables.
Also, for my home with only 400 sq/ft of hard flooring, the fresh & waste water containers are way too big. They would only need refill/emptying once a month. Waste water will get nasty smelling after a week, so I empty & rinse mine after weekly mopping.
And finally, if possible, I recommend using distilled or filtered water to avoid long term issues from calcium and other buildup in the robot & base pump. Waterwise.com is what I use for 25 years, is all I drink (you'll be shocked at the poisons in today's tap water. Just say'in.
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The base is big, like need to plan where it will go big. And I think the map setup stinks compared to Roomba, took a lot of work to set up rooms in an open concept house. Mine also has a couple spots where it gets confused in my house...wide open spaces where it thinks it is boxed in.