I have the barnett pressure plate with kevlar discs. I like it a lot. Still going strong after >1000 miles of abuse.
I think the TW clutch mod kit is an unnecessary gimmick. I've never seen the rationale behind what they claim. Heck, there are guys out there with several thousand miles on stock clutches. The only reason I upgraded to the Barnett was that I had the damn thing apart to do the 70/30 gear reduction. So I figured I might as well put a stouter clutch in. Otherwise I'd still be stock.