Bobby G's Chicago Eatery is in the restaurant complex at the Lindberg MARTA complex. Let me warn you that the parking situation there is confusing and you may have to pay to park.
I had a Chicago-style hot dog and a tamale. They also have Italian beef and deep-dish pizza. The dog had all the basics but it lacked zing, in my opinion. In particular, I didn't get the hit of celery salt that I associate with the classic Chicago dog. The other flavors lacked impact as well.