I went last night. I'm originally from Chicago too and agree with cinzia about the Rush St scene.
Atmosphere: loud, fun, full. No line out the door, but no empty tables either. I sat at the bar, though the bartender (previously of Ford's across the street) said I might want to check out the upstairs lounge and patio.
Service: Plenty of staff, friendly quick service. Not a hiccup all night.
Food: Disappointing. I wanted to order the night's special - a Pressed Dip Sandwich - which I have fond memories of from Chicago - but they weren't doing the specials yet. Besides the dip sandwich, they listed Chicago Style Hot Dogs (did you see J. Gold's article about his city-wide taste test? Fantastic) for Mondays and other not-necessarily Chicago-style things... and omitted the Italian Sausage? This will surely be on the next (spell-checked) version of their menu.
My pulled pork sliders were on 'grocery store' pull-apart rolls. The pork was tough. The coleslaw and pickles were the best thing on the plate. The bbq sauce was OK. Asiago French Fries were above average. The aged burger was just average, a bit salty. Nothing novel. Chicken Lollipops seemed a bit to frilly to be on a Chicago-style menu, so I wonder even how Chicago-style they want to be.
I don't know what I was expecting. Is this like when a French tourist comes to LA and goes to Anisette? It will never be exactly authentic because it's not Chicago, but I would gladly pay more than $9 for three pulled pork sliders if they were of excellent quality. This restaurant probably serves the neighborhood well in that it's not that expensive but has a good bar/lounge scene and a full cocktail and beer list.
I went to Fraiche across the street for dessert, which was just right: Peach Brown Betty with Greek Yogurt Ice Cream. Came with crispy sweet croutons - mmm!