I've had my 9300xi for a couple months. I use it about once a week. Last week I saw something at the bottom of the pool, thought maybe someone threw something over the fence. Turns out is was a real wheel off the unit. Have been trying to call the company as this wheel has almost no material at the point where it broke. It is paper thin. No wonder it broke. Turned it on it side to see if I could remove it and the other side broke off. Not too happy with Polaris products right now. I paid dearly for this thing and for it to break like that from obvious design or fabrication flaw is pretty disappointing. Now I have to replace two wheels. That is if I can ever get through to the company to try and have them send me some. Hopefully they have realized the problem and have a thicker replacement unit. If not this will continue to break.