The Spec is a very similar design to the Tex so is probably prone to the same break in problems. shudder might not be so evident in a Cobra since they are so much lghter and it doesn't take much to get one moving.
The spec is probably a fairly expensive too but maybe cheaper than the Tex. The pressure plate and friction were about $450 and the flywheel was about $400. I then had it all doweled and balanced which was probably another $100. At the time the factory clutches were all plagued with problems so an aftermarket was the best choice. Now that GM have fixed that with the LS7, the factory clutch is a really good option.
My Spec III
Cheers