I've got a Neato XV-21... For the most part it's pretty good, it's amazing watching it navigate tight spaces and corners and stuff. Picks up all the pet hair daily. It takes it around 3 and a half hours to clean our 1900 sqft place (it returns twice to charge during that time). It can be finicky finding it's docking station with the IR sensors, so you have to have it out in the open against a naked wall which is kind of annoying. It's also quite loud, so running it at night is out of the question for us (I usually put on headphones if it's running while I'm working, or start it manually when I leave the house).
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