I had the bacon cheeseburger and the "shack"-ago dog (their rendition of a Chicago dog). I also tried one of my friends' frozen custards and cheese fries. The food itself is quite good and the employees are very friendly. The restaurant is clean and everything is pretty much as it should be. Four stars as I feel the food was quite good but not excellent... Something was missing that I couldn't put my finger on.
Regardless- check it out!