No personal experience, but GM picked the Trofeo R to go on their Z28. Say what you will about GM, but
they don't mess around much with performance. The z28 got pretty glowing reviews across the board for track use, including good things said about those tires, but take it with a grain of salt. Not sure if the goodness of the trashcan sized tires translates down to the (surprisingly affordable) 15" sizes, either.
Chevy has since moved on to the Sport Cup 2 for the z06, possibly because they're (somehow) rated as 200tw vs the 60tw Trofeo R.
Trofeo R:
Sport Cup 2:
