I've been here twice with coworkers and I love it. I get the cheese burger, no bun, onions, mushrooms, and a side salad. $15.
I've yet to try a milk shake but it sounds awesome. I'm just not sure I want to be ill at work the rest of the day.
BONUS: super clean amazing bathrooms in the basement! Get the key on a huge spoon from the order taker lady, and proceed down down down down... into the cleanest basement I've ever seen. Don't get me wrong, it def feels like rape city, but you're not there to hang out, just do your business and go!