Burger is Chicago's answer to In-N-Out. Their first location on Huron Street shares a kitchen with its higher-end sister restaurant Tru. You can peek into Tru's kitchen and see the chefs work their magic on creating multi-course dishes, all the while chomping on some great burgers and fries that will have you in and out in 15 mins.
Unfortunately M Burger doesn't hold a candle to In-N-Out burgers but it doesn't mean they aren't good and you can't enjoy them from time to time. It's obviously caught on with the rest of Chicagoans since they subsequently opened up three other locations in downtown. Their most recent addition is in Water Tower Place.
They all are housed in a fairly small space with a few counters and benches to sit on. They offer a simple menu of hamburger, cheeseburger, fries and shakes.