I've been at the Knoxville location a couple times. I liked the burger. The fries not so much. It's pricey.
Cookout was mentioned. I like the value of the place, but I tend to stick with the chicken sandwiches instead of burgers there.
I like Five Guys for the fries. For the burger, I tend to over-order condiments and it becomes a sloshy mess. In-and-Out has comparable fries. The burger there is different from what we're used to because it's a California vibe where the lettuce is prominent and such. I love that place, though, simply because it's a required stop if I go to Vegas.
I should also talk about Tommy's in LA. I was tipped to go there by a friend from LA, and he said to get the chili cheeseburger. I did. When I tell you something is nasty, believe me, that burger was nasty. Got a cool Dodgers cup out of it, though.