One thing I've noticed...
if you see nice cars in the guy's garage when you walk in, its usually a good sign. Nice cars belong to richer folks, and they usually don't mind paying the premium to get the work done right.
In the case of a dent on my side.. i know a guy that has Vipers, Porches, and even a Lamborghini and Ferrari frequent his shop.. Was a no brainer, cuz this guy was the cheapest too

Great work he did.