I put over 30k very hard miles on my last CenterForce dual friction clutch before I sold the car. (it's still going too) I also had 350HP/400TQ or better and running 20-22psi of boost. Never slipped once. I revved to 7500rpm.
Of course this was the complete DF set including pressure plate. I hear some of their clutches are disc only. But on that note. The SVT pressure plate is quite a good unit already.