it's better than Five Guys. Burgers were fine, as you'd expect, the thin variety. I tried the special garlic parmesan fries, and found them a bit too greasy for me; next time, I'll get the regular ones.
My favorite style of burger, though, is the thicker pub variety, about a 1/2 pound, cooked medium or medium rare. Smashburger is closer to a Steak and Shake burger, not that there's anything wrong with that...