The guy that owns the one by my house is very good, and watches his staff closely....He used to have the one in surgerhouse too.
But one day I had the Miata in there (to low to change at home), the service guy was going through the check list with me....Said the checked the battery and added a little water to it....I said "oh really, Thats interesting" let it go and went and talked to the owner....(Miata batery is in the trunk, which they never opened, AND even the stock battery is sealed, and this one was an optima!!)
It was very funny to watch the owners face turn red! I got a free oil change, and as I pulled away, I could here the dude getting his a$$ chewed
Way back when, I worked for a shop with a contract to fix the tcases and manual tranys they messed up....2-3 a week came in with stripped drain plugs....or burned up because the stripped plug fell out!!
Most are franchises, so sometimes you find a good one, but....