Performs well when first installed with GreenStuff seals. In less than 3 years and 20,000 I had a vibration in the brake pedal. Went knocking somewhere to change the pads and rear brake discs. I had never seen this before, but the metal came off in pieces. I'm glad I looked at the first sign. Could be bad I don't know how EBC rotors are made, but I've never seen anything like it.