My 1st robot vacuum and I'm absolutely loving this thing I named "Thing."  And the BUT is a small issue: while the  claim of hair not tangling up on the roller is very true, what it does instead is gather inside the cavity on one side of the roller that clogs it up from spinning freely and I get the error code that something has blocked the vacuum and to check under it. When I got that error after only 2 days of running it, I couldn't find anything under it blocking it. It was after a Youtube search where I stumbled upon an answer and had to remove the roller to clean off the end of it. Not a huge deal as it'll just be a routine I have to live with with a hairy aussie in the house.