Loved it! I split a buffalo chicken tenders basket and a Bacon BBQ burger. The tenders were VERY spicy, too hot for my liking. I loved the fries that they came with, though. You can get regular, sweet potato, or a half and half mix. They have tons of different sauces to dip your fries in. We loved the Cajun Ranch and Honey Mustard. You help yourself to the sauces so you can try as many as you like. The burger was delicious - juicy and very flavorful. Burger 21 serves one of the best burgers in Pittsburgh, in my opinion.
We also got a banana fosters milkshake. SO GOOD. Very thick, though. It was my favorite part of the meal!
BEWARE: if you or your child is sensitive to noise, the milkshake machine makes a horrible noise. Metal on metal ear piercing shrieking. Reminded me of the drill at the dentist. I will be getting takeout or eating outside because of this noise - gave me chills. Otherwise, awesome restaurant!