I really enjoyed the wings here because they give you a healthy helping of sauce for the wings and the flavors are really tasty. I typically get medium, hot or the "kitchen sink" flavor. In my opinion, those are the best flavors!
I would typically go to William Penn on on the 50 cent wing days - the only down side is, you can't take it to go! I would stop by William Penn as a pre-dinner snack (6-8 wings) before I ate my actual dinner.
It was also a great place to stop for dinner before going to the different bars and shenanigans happening on Walnut Street.