Great bot in this Range.

Dreame Z1 Pro delivers in this $400 price range. Cleans between 700-750 sqft on stand full clean mode. Lasts about 165-175mins and usually filters about 21000 gal of water. Not bad.  Definitely picks up and maintains the daily junk that falls in the pool. It took a bit to figure out but now not so bad

Tips I've learned so far.
- wifi signal by pool need to be decent for the app and Bluetooth works fine but only before you put in the pool.  I set my desired cleaning Full/Wall/WL/or bottom in the app then hit start it then tells you place in water. The hit ok.

*These pool bots are to maintain a clean pool, not clean your pool when you open it and your water is black and full of leaves. You'll be disappointed with ever not if your using it for that.

My pool is 20x40 with 8ft deep end. The remote works but only if it can see the sensor on top of the unit. The retrieval button works great unless you depleted your battery during cleaning. At this point you have to hook it out.

I found with my size pool a large run time unit is needed. The unit can complete cleaning tasks individually one at a time.  But not all-in-one, my pool is just to big and unit lacks the battery capacity.  It would be nice to have a 3 day run time model or even a self docking unit so it can charge up if need to complete task.

Pros-
Does what it's say
#s are on point with advertise
Suction is good
Filter catchs lots of small particles
Climbs walls and water line
About 175min run time
Avgs 735sqft coverage on regular mode
21k gallons of water filtered per use
Set retrieval spot
Nice sleek design

Cons:
If battery depletes, retrieval doesn't work
Only 2.5-3hrs run time not enough for 20x40 pool
Wifi need to be good and Bluetooth works only prior to submerging unit to set cleaning modes.
Slightly heavy when removing from the pool but still doable

https://vimeo.com/1201993098?fl=pl&fe=sh