I have the Switchback 700 and i put 5000 hard miles on it this winter and haven't touched it. My dad bought the 800 and the motor ate teh valves, i guess its a common problem? I like it it goes good but pushes in teh conors. I talekd ot a guy with a Pro XR and he likes it but said its slow and doesn't have a big gas tank. I guess its what kinda riding you wnat to do?