||I know you'll argue that they can't hold 600HP... but for overall performance, grip, ride and noise they are a total package tire.
If you're running R comp or drag tires to get grip for street driving, you're only looking at one function of tires. If that's all you want, then problem solved.
I hate running my R-comps (currently Nitto NT-01's) on the street mostly for the noise and the jerkiness over rough pavement. Only do it going to and from the roadcourse.