I went here a few days ago with a friend of mine and got The Big Stack burger ($17) and a S'mores milkshake ($7).
The burger patties were pretty good tasting and the burger in its entirety was extremely filling. The downside is the difficulty of fitting the burger in your mouth to take a bite out of it, and the relatively thin bun quickly becomes soggy- you will definitely be making good use of your napkin! My friend got the Avocado Bacon Burger ($13) and was satisfied with the amount of food.
The milkshake was amazing. I highly recommend getting one.
The service was lightning fast. The server apologized for taking a short amount of time to get to us and was very attentive and helpful. No complaints in this area!
Great experience overall.