I avoid the chains. They tend to have a schedule of repairs that they require you to have done whenever bringing something in...
Example: Brake line burst on my 96 S-10. Pulled into a Firestone. They said they had to replace all the brakes, hardware, rebuild the calipers, etc. Dam thing only had 50k miles on it! :|
I called AAA to tow it home and I'd replace the line myself (not like it's terribly difficult), and the guy showed up, went inside and told the manager that his towing company, a large one, would never bring any business to him again if he didn't just fix the @#%$@#$ brake line.
They did it, but I inspected the piss outta that truck as soon as I got home. I wouldn't trust a pissed off mechanic as far as I could throw him.