CARS did work on our Jetta in the past and everything always went smoothly. More recently they did a quick repair (computer for the transmission) on our Porsche 911. The car wouldn't go into gear right after we had it detailed for sale. Someone was coming to look at it in a few days which put us in a bind. CARS diagnosed the problem, ordered the part, made the fix and got us up and running in time for the car inspection. We remain friends with buyer and he has had zero problems after the fact.
We will take our BMW M3 (see the German trend?) there when it needs work...although we hope that doesn't happen soon.