hey Chris, first of all i am new here, but i know a lot about vacuum robots, on chinese market there are a lot of cheap models that break almost instantly, also there are a lot of ppl who wanna sell you trash with good advertisement, this is the main problem there. I even have in Pekin who had robo vac which broke after 3 months, so this is how it all works in China. I myself know a lot of good models but only on american market i even have my own Bobsweep bio vac at my place and it works fine bro, if ya want to talk about this im open i can even send you some link of good robo vacums.