my buddies KFX is nice(08 all blacked out :grin_nod: ), but still cramped for me (Spoiled by Raptor). The seat is hard as FERK, but I was standing on it most of the time anyway. The KFX is ultra nimble IMO, even more so than the YFZ. It also jumps level and is flickable mid air. I'm not overly impressed with the power in three mod form (Dasa, Fuel Atv intake, PC3), and I haven't seen a Cam that makes much of an overall improvement to make a 4th mod worth while.
Overall It's a great bike, and until Yamaha gets off there asses on putting FI on the YFZ, it's a great trail and track bike.
Aaron