I've never been disappointed by a shake before. I have no idea what was wrong with my blackberry shake; maybe it was the fact that it wasn't cold (it was just 'cool')..
The burger were very, very tasty. Yeah, it's not the typical Madison fare, but a different burger (esp. ones like the pimento cheeseburger) makes for a great entree. Their sweet potato fries are thick-cut and definitely worth getting.
The ultra-modern decor (gray) and service (curt) kinda adds to the vibe that this place caters to the passers-by and isn't interested in making any friends. It was incredibly hard to pin the crowd that would frequent this place; while we were in for weekend lunch, there was a church group, casual bipsters (yolo), and young families.
All in all, grab a table if you're in the area. I dunno if I'd make it a destination.