What a great airport. The indoor mall they have is extremely high end. It's unfortunate that the public doesn't have access to these great stores. The layout is also great. Once through the somewhat unfortunately very long security lines a tram takes you to gates A-D which all branch off from the tram. There is a food court also centrally located. Also, they have moving walkways to take you from one end of the gate to the other.
One of my favorite parts about the airport is all of the Pittsburgh memorabilia that looks like it came from museums. From the giant T-Rex skeleton to the Franco Harris "immaculate reception" statute, it's very neat. Also, the charging pods they have are everywhere and always available and the free WiFi works decently well.
Overall I rate this as one of the top mid-size to large airports in the US. It's clean, user friendly, and culturally in touch.