I've only been once but it was a good experience! Very family friendly..we went around 6pm on a weeknight and it wasn't too crowded. They have lots of options and a cheap kids menu. My husband and I tried the ahi tuna burger and the Thai shrimp burger which were both yummy and my daughter ate almost every one of the sauces (they have a huge selection you can pump out yourself). We loved the apple cider sauce with sweet potato fries. :-) the company that owns burger 21 is also the same as mellow mushroom and the eclectic menu is worth checking out!