Stumbled in here after some heavy drinking for Mifflin. I've been to the Milwaukee location a few times so I knew what to expect.
I had the Milwaukee burger and it was pretty good. I've never really put AJ's burgers at the level that it seems everyone else puts them. Yes, they're good, but not elite. The sauce that they have though is outstanding. Tangy and kind of sweet = AWESOME. The buns are really good too. I just think its dumb though to basically have an a la carte menu. Why can't you just have fries come with the burgers? Why does everything need to be separate? The prices for the burgers also seem pretty high for what you get. The service we got was great though, the waitress was very attentive.
Overall, it's a pretty good place to have a burger, especially when inebriated.