I went to an autocross yesterday and my first impression of the F1's is quite good. With the new rubber the car was a completely different animal. Instead of losing the back end and spinning the car I found myself pushing the front end a little. I ran 36 psi in the fronts and 38 psi in the rears and it felt really good. The bad part was that I lost to a S2000, but the good news is the pushing can be easily corrected by getting my head out of my rear and using the brakes a little more before the corner...