Not a bad quick-dining option if you're in the Stonecrest area. The food is consistently good, but never really memorable. I would define the quality of the grub as being stuck somewhere between a fast food burger chain and a Bad Daddy's or Cowfish, more along the lines of Five Guys (just not as good).
Service is soild - you order at the counter, take a number, and then your food is brought out to your table. The management team has done a good job of balancing speed with the quality of service and the quality of the food.
We frequent the establishment mostly because we have small kids who eat anything deep fried, dripping in cheese, or made with ice cream. They love it here. The fountain, stairs, and live music in the outdoor space between Smashburger and the other restaurants/shops right there make for a perfect spot to let kids run around and burn off some of their chocolate shake calories without disturbing other patrons.