Well known tuners also have their problems. According to some they don't..
My local dealer is pretty good, did a service on the Roc, and all seems to be good, service advisor detailed what they had done, what oil they had used, and handed the car back over to me.
They checked the car prior to and post the service for damage.
Also topped me right up with good coffee, and gave me my key back with a new key ring on, old one was tatty.
The dealer in the next furthest town is utterly shyte though!