Well, I wished I would have gotten the 600 SDI. Racing my buddies there is barely two sled lengths difference if we get a even jump, and he can beat me if he gets the jump. My top end on gps is 99 mph, 102-103 on speedo. Anyway, too close in my opinion. Also my 800 doesn't consistently go into reverse, and dies about 30 percent of the time when the button is pushed. Also uses more oil and gas, and is harder to start. AND I here the 600 SDI is now the least powerful 600. What does that make my 800 then ?