Clays Radio shop used to be one of the best in the business years ago. In recent years, however, the quality of their work (from a technical standpoint) seems to have gone downhill. I used to go a couple years between seeing their radios come in needing anything redone. Over the past couple years, though, that number has been steadily climbing, and most of the work is related to improper tune-up methods. It might be just coincidence, but other techs I've spoken with have noticed the same thing.
I'm not saying don't use them, just do a bit of careful research on their methods before you decide.