I only go here when I'm desperate for cigarettes or gatorade.
The prices are higher than any convenience store I've ever been in, and the selection of cigarettes is severely limited (no parliaments here!).
The staff is rude and extremely cautious, they watch your every move from the moment you enter the door. They aren't located in a great neighborhood, so perhaps this is understandable-- but is the bulletproof plexiglass needed for the register?
Big drink selection, and a good snack food choice.