I've done 6 track days on these tires. In very cool to very hot conditions. The feel of the tire was always good. They never surprised me at the limit and gave me time to pull it back when over the limit. My only disappointment is that the wear was not even and will require me to replace them a bit early. This may me because I ran them initially with too low a pressure, but the rubber just inside the outer groove wore away very quickly. Now the outside shoulder is down to the cords but the two grooves show enough rubber to run a couple more days. I should have flipped the tires to even the wear, but I did not realize how close the shoulder was. I did not see a big difference to the Kumho 710 I ran before, so for the price I'm going to try them again.