I'm running an XTPP with 6 puck sprung hub. It's Meh. It holds the power, but the pedal feel is AWFUL. I don't know if it's my tranny, or WTF is going on, but It's like you need to exerpt at least 40lbs of pressure on the pedal.
I'm going to a Competition twin disc clutch. Stock pedal feel, and holds GOBS of power.