I don't know anything about these guys. I remember seeing them in airports all over the east coast. The food isn't bad, but since it's I was in airports at the time it was super expensive.
I've seen one in Monroeville Mall in PA their foods not too bad actually.
Theres one in Neshaminy Mall's food court. Its good but yea you'll be spending around 5 bucks or so for just the burger.