I liked them because I could use my stock calipers and race pads for the track. 100% increase in braking power and did and excellent job on and off the track. I used them with Hawk HP+ pads on the street and HT-10's on the track. I now have stop tech 14 inch diameters all around and they are fantastic but now the car is strickly used on the track. Worth every penny but only if you are racing.