Well, I rode my KDX200 back to back with my KX250 at the MX track yesterday. The KDX did pretty well. It didn't have raw power out of the corners that the KX has, but I was actually impressed with it. For play riding on a MX track, the bike works well. Granted, the suspension was soft, but if you clear the doubles properly, you don't need stiff suspension. Yes, I'm much faster on the KX, but for anyone out there wondering if a KDX will work on a MX track...the answer is yes. When it comes to MX racing though, I'd have to say....the KDX just doesn't have the power/suspension to compete. However, if I was to race an enduro or harescramble, I'd probably ride the KDX because I can ride it longer without getting tired. ;)