There's not much I can say that 130 other reviewers haven't other than the fact that it is worth braving the line (or at least forcing a mid-afternoon "snack") for.
These are flat top style burgers which means that the meat is fried on a griddle instead of grilled over a flame and the result is an extra juicy burger that is amazingly tender (since the cooks are very careful to only loosely form the patties so as not to overwork the meat).
I stuck to the basic cheeseburger to test the place out but next time I go I'm definitely adding "the option" (aka a deep fried portabello stuffed with cheese).
These burgers are so simple yet so good and all in all I'd probably rank this as my favourite burger in the city (runners up would be the ones at the Stock Yards and Big Smoke).