I have them and love them too. I'm running 255's all the way around. I agree that they are much better than the the F1's. I'm at 500hp/530tq and I have very little wheel spin off the line without power breaking...sometimes none. Maybe that's because of my heavy ass Magnum with 100lbs of stereo $hit in the back though. It does chirp into second every time and occasionally into third but overall they're pretty sticky. They're quiet and ride smooth. I wouldn't hesitate to buy them again. Hope that helps.