It is too bad you can't take these to a Mercedes Dealer for warrenty service. the independeant I found to help me with some ECU programming was shocked when I opened the hood of my car. He had never been under the hood of a Crossfire. He made all his other techs stop what they were doing and come take a look. They all laughed and said it was 100% SLK320 under the hood and they would feel comfortable working on anything on the car.

I myself will be buying a servicing CD and only use a mechanic when I can't do it myself.