The hype is just that, hype. In my opinion, there is nothing better than the Diablo's at the moment, and Michelin are Michelin. They grip well enough, but they offer sfa feedback, and while you're never actually having much trouble with them, you always feel like they are about to let go, and that doesn't lend itself to riding fast. Stick with the Diablo's is my suggestion.
btw, for most guys, something like the Strada's would be all they'd need at the track and would never get to the limits of that tyre. It's amazing the amount of guys that insist on Diablo Corsers or the equivilent, and you see them at the track, and they could get away with Bridgeston 020's and not reach the limit. hahaha. But it's all in the head.