I brought in my 12 year old M6 with the air conditioning not working, in need of an oil change, and the minuscule hope that Marc could reprogram the SMG transmission to get rid of the clunking, and glitchy shifting. I picked up the car, and it performs like the day I bought it. No other shop could do this level of repair. They even washed it. I am VERY picky and I am totally satisfied. I won't go anywhere else.