I had a Competition Clutch Kevlar Carbonite series clutch. It took a ton of abuse for around 30k miles, extremely high rpm, fucked up stock flywheel (spot welded the ring gear to the disc!). When we took my motor apart and took the clutch off a good handful of kevlar/carbon dust fell out and every spring was rattling like crazy! lol. It was shot to hell but it was still holding and shifting rather well. My application and yours are very different but I would say that 30k with the abuse my clutch saw, (dd,autox,drag, 9500rpms regularly) it did fairly well.