Fantastic tire. I teach for and drive with track groups. I track at least once a month if not more, and while I may not be on every session, I do get out there. I run 275/40-17 front and 315/30-18 rear. I did have to change the alignment (including ride heights)but dialed in, awesome. Throttle on gets power down to the floor, corner grip shocks everyone i give a ride to, and braking has gone to a new level. In corners, this tire has a gentle break away, allowing for good and controllable slip through turns, and even allows for easy throttle induced rotation that is easy to manage. Throttle on exit grip is much improved, allowing me to use lower gears that otherwise were useless (on stock GY's). Braking is tremendous, switching between these and the GY-F1's (or my new street tire, NT-05's)shows this off. On lesser tires ABS comes on so soon, you will get addicted to the brake force you can create (shows off high friction pads). This tire has held up to heat very well also, event to event it has stayed consistent and predictable, just ordered my next set, so yes, I like them.