Again, as i have told you guys in this thread before:
STOP SPREADING CRAP that is unfounded, unbased, and not backed by ANY factual information other than your hearsay of YOUR particular issues.
Spec clutches are a great performing clutch. 99% of the users, you never hear from (because they had a GREAT install.)
.75% are able to say "oops.. I installed it wrong" or "dang.. I forgot to turn everything, and skipped out on some essential steps.
However, you always have that last .25% that scream and holler about crap that they brought on themselves. Many, MANY people are using Specs. Spec Stage 1 is comparable to a stock SVT clutch, stage 3 is the higher performance (Forced induced, or BUILT BUILT 3L)
Stage 2 is the only one I would PERSONALLY avoid, but that is due to being made of kevlar and glazing rather easily, if you don't know how to drive correctly.