I got a Spec Stage 3i and I have finally gotten used to used, or it has finally broken in. I fucked up and kept the stock input shaft (know one on modular fords was talking about that when I ordered it). Anyways the spec has a lot of shudder, but I'll tell you what, I can powershift the shit outta it w/that clutch. It's like a different car.
My stocker was so fried at 11,000 miles that I had to have the tranny replaced and I KNOW how to drive stick. tThis is my second Cobra and fourth Mustang. My first 5.0 was on the stocker clutch when I traded it in w/ 149,000 miles.