I tried one in the DC area a couple months ago, and was pretty impressed! Great, tasty burgers and humongous orders of fries. A little too pricey, though, even for the quality and portion size.

Definitely get a regular order of fries and split it with someone. Three of us were in my group (two adults and a 5-year old). We ordered two small orders of fries and a large one. One small order would have been plenty. The cajun fries were great. The selections of toppings for the burger is unmatched.

Take note, though, that if you ask for "everything" on the burger, you don't get everything - just the items they mark as standard. Fortunately, thanks to the long line, I had plenty of time to catch that on the menu that lists the available toppings.