I've had 2 Spec 3+ clutches. The first one welded to the flywheel but I dont blame Spec for that. It was my fault for trying to slip the clutch at 6 kit with the nitrous on. From my experience with the Spec 3+ I find that it doesn't like to be slipped. I had many passes on both of my Spec 3+'s. The one thats in the car has seen many 6800rpm launches. The key (in my case) is not to slip the clutch. Neither one ever slipped on me. The first Spec I had lasted 15k miles and still had life left when I pulled it out. Before I welded my 1st spec clutch, I bought a spare 3+ to replace the one that was in the car because I enjoyed that clutch so much. Both of my 3+'s have great street manners and hold more power than I could throw at it.
I had a Centerforce clutch that I hated. It slipped pretty bad and when I pulled it out it still had plenty of life left. After the Centerforce I boutght an LS7 clutch which was the most comfortable clutch I've ever driven. I really liked the LS7 but mine had pressure plate issues after 14k miles and wouldn't disengage, Enter Spec 3+