They seem to be a big group... run gigs all over the Southeast as you say... I think they are moving towards the AMC model. With a practice as big as they are there is little chance to become one of hte super duper partners (correct me if I am wrong). That all being said, I know that in Charlotte they are well respected for being good anesthesiologists- most are quite well trained at least. They staff Carolinas which I think is a great hospital, lots of good exposure. etc.... I applied for a job with them coming out of residency and they wouldnt interview me for any of the Charlotte gigs- only the periphery (Hilton Head, Rock Hill etc.) They told me they prefer folks with fellowship training or folks with some experience.
