As I have stated in previous posts, I have EBC Greenstuff pads and EBC Sport rotors on the front of my car. I really like them and ordered the EBC pads for the rear. I had noticed a vibration when braking but thought it was the rear rotors warped. Well, I had the rear pads and DBA slotted rotors installed today. The rear rotors were not warped; the front EBC rotors had warped. They have just over 5,100 miles on them. I do not abuse the brakes and neither does my wife. Also, we don't race the car. Have no idea why they warped. Talked to Jake at Tire Rack where I got the rotors and they have shipped me a new set today. I will have these installed next week and will have the wheels torqued to 70 ft/lbs and see what happens. Will keep you posted.