I can't speak for now, but about three years ago I got to go to this place after a show, and for a hot dog it was pretty good. The mistake I made at the place was trying not to be outdone by the rest of my party who were all ordering I believe was called the Road Kill dog. It was a great hotdog, however I was unable to finish mine off.
As far as atmosphere goes, it is a straight up dive. The guys behind the counter were very friendly and helpful on what their different selections were (as far as what came on your dog). I will admit, I'm not a hot dog connoisseur, so if it's not really Chicago style I can't say, but it's a good hot dog one way or the other!