I have them in but have not used them yet. Installed late in the season and now car is parked for Winter unitl May! I have heard good things about them and they look like a nice spring. They drive well and are not noisy on the street. The car plants well and leaves straight, just have not hit the track with them yet. I did notice the front comes up easier than the stock springs. I also have no sway bar and Lakewood 90/10's.