I've been going to Nalley in Marietta. Mainly because that's where we bought the car. I can't complain. We bought it CPO, and they've taken care of a number of things under warranty for us in the last year:
Pulsing brakes (new rotors, different cooling ducts)
Scratched interior trim.
ECU reprogram (didn't like the abrupt throttle tip-in.)
Replaced wiper blade on driver's side.
Idle problem.
And we've never had an issue getting a service loaner.

 

update:

replaced my sunroof
replaced rear quarter panel trim
replaced driver side door welt (idunno what this is)
ordered some aluminum panels because they scratched them when working on my shifter boot (mine had some previous scratches so I am glad to get brand new pieces!)

I have to replicate the idle drop next time I go in because they couldnt replicate it.

overall I am pleased with the service I received. They replaced things that had no TSB so they went above and beyond and I had zero hassle. I will write them a good review