They are a franchise, not a chain, there's a difference. You pay to put their name up on your bodyshop, different one's are different quality.
However, if you think you're going to roll out ready to take best of show at Carlisle after their 299 Ambassador paint service, think again. For 300 bucks they are going to scuff, it tape it, and shoot it. I don't blame them either, body work requires some real time and patience. You can save yourself some dough by pulling your door handles, tailights, headlights, etc before it get's there.
When you know perfectly well a quality paintjob cost's at least 2k, don't expect the same quality for 300 dollar's...
Lot's of people build and sell transmissions cheaper than me, I'm sure they work fine to go down the road in a stock car not being abused ever... But that's about it.