Great local place, the food is delicious. I don't know how "authentic" it is, it feels different than any place I've visited in the Phoenix Metro area. There are dollar bills covering the walls, lots of celebrities and everyday people leaving their mark. We need more places like this to experience the culture of other cities.
We ate a philly cheesesteak, naturally, it was delicious. We got the cheese wiz on top and some great fries. Highly recommend stopping by at any hour (they are open 24 hours).