Have been a repeat customer for several years now and so have developed that trust which I think is the most important thing with a mechanic. They're the only ones who have ever gotten IN THE CAR with me when I first bring it in and DRIVE AROUND to make sure we're on the same page about what my concern is (what noise, what vibration, whatever). Maybe others do this too, but I've never encountered one. If they make a mistake, like a human might, they go out of their way to get it right. Happened once and it was resolved just fine.