Despite working in the Loop, I've only been once (and that wasn't even on a work day). Still, I enjoyed the tamal and soup very much. They usual have some kind of tamal special along with the regulars (pork, chicken, and black bean, I believe) as well as quesadillas, soups, and salads (the menu was small, but I'm sure I'm leaving out a lot of items).
Also, when I was there, Rick Bayless was in the kitchen making notes, which bodes well for the quality.