I hav'nt did any enduros yet but I will. I'll miss the wide ratio tranny on the high speed sections. Another thing that might concern me, never having a 4 stroke before would be the really gnarly sections where you can't get out of 1st gear for what seems forever. The occasional bottle neck , especially on those "killer' up hills where there are a bike or a few stuck and blocking the only passable way and you're behind them 1/2 half way up the hill sitting at a 45 degree angle. Mine seems to get really hot with no air passing through it.
I did a GP race (comb. hare scramble and MX) last Sunday, and it was frickin' awesome! I was beat on the start (MX style), but it had plenty of power even in deep sand, and the light weight/easy handling made me last longer and ride harder all the way to the end of the race.
Mine is set up for MX, not woods, but it does great there anyway. BTW, i have a PC Ti4 ex. w/ 42 pilot/165 main, which really improved the power and throttle response througout the curve.