Thanks! I had seen the reviews about it getting stuck in the deep end and also saw a Q/A on amazon where the question was from someone that had a pool with shallow and deep end and would the robot work; the seller answered that it only worked with a flat floor! I was surprised and thought maybe it was possible it had some separate wall "mode" that only kicked in on 90 degree walls or something but not slopes. So I wanted some real world answers! Maybe the "flat floor" in the website graphic means those tracks don't do well on rounded transitions from floor to wall? Anyway, I'm seriously considering it. On sale on the Aiper website for $579, and after putting it into the cart, adding my e-mail to Aiper's list, and waiting I got a 15% off discount code, making it $493 with free shipping and no tax. My Polaris 9550 cleans well but is getting long in the tooth and needs new brushes, basket, and rear wheel treads at least. Those parts are all super expensive for what they are! So I'm still debating with myself ...