I drove on drag radials on the rear for about 2000 miles with sport cups on the front, they get very loose quickly on corners but are great for acceleration in a straight line and are nice and sticky. They were very prone to wandering in ruts on the freeway but were even better than the pilot sport cups at cold weather traction when it was 50 degrees out and good on stop light dashes.
I used up about 40% of the set during the autocross at VOI-10 in Detroit, gave rides to several people, probably the most fun I have had with the car, it was pretty fast as I could get the power down out of the corners but once the side wall flexed it quickly became a drifting exhibition, especially after they got hot.
If you overheat them, they will wear out quickly and they don't last very long to start with....
James