I currently work for them part time at one site. In general they don't pay very much. They are used to having cushy contracts in Austin where they don't have to pay to attract doctors. It's a CMG with a pyramid scheme of partners. The guys at the top are making bank off of the new grades and pit docs who don't have partnership. Everyone wants to move to Austin, so it's easy to pay the docs below market rate for Texas.
I'm lucky enough to work at a site in a less desirable area where they have to pay a lot more than they typically would in order to keep the docs.