Group One Motor Werks was recommended to me by a friend who was also one of their customers. I had had a previous very bad experience with another repair shop. The people at Group One listened to my description of the problem with my Cayenne, analyzed the location of the problem and dealt with it promptly in a fair priced and efficient manner. i recommend them with no reservation. When I came to pick up my car i was met by the owner, Mark, who had test driven the car and pronounced it sound. My car had been washed and cleaned.