I got a used Aquabot Turbo T. It can't seem to climb the 90 degree walls in my shallow end, but does OK once the pool starts to slope down and the angle from the bottom to the sides decreases. The treads look pretty worn, so I think that might be the problem? I was also thinking of just ordering the kit that has all the common replacement parts in it... drive belts, treads, and brushes. My water is also less than 70 degrees, which the manual mentions may cause the brushes to be stiffer. I don't mind geting some replacement parts if people thing that might help. FOr the price I paid I will be happy if it can clean everything except the walls in my shallow end.