Small sample size here, but I recvd the Scuba S1 about a week ago and have used it 4 times since. I'm very happy with it (as long as it last 3yrs, which is 1yr beyond the warranty date). The charger itself gets very warm even when not plugged into the robot, but I have other chargers that do the same thing. I just keep a mental note not to leave them plugged in and to charge outside. The plug port for the robot is not waterproof which is the dumbest thing ever, so make sure you let it fully dry before charging. And the filter will catch 95% of everything in the pool, but I'm with exploring 50 micron fishtank filters to catch the fine silt/dirt that gets thru.
Again small sample size, it's only a week, but I got it on sale and if I can get 3yrs out of it I'd be pretty happy.