I just wrote to S BMW today to refund my money. The rotor came in very poor condition. The packaging was taped multiple times and the rotor looked like it was sitting in weather for quite some time or on the shelf for a bit. It had a metal burr machined into the rotor that was causing it to clip the brake pad. It was so bad it grooved a run through the brake pad basically ruining it. The front that I have mounted has no issues and running great performance is fantastic for the cost of these. They should come out of the factory or fabrication better than perfect.