For 30 seconds, I get to be a kid again riding up and down the hydraulic smooth glass elevators, with the fountain view. This is the best part about the library. The effecient energy oriented building architecture is probably one of the best example of civic offering from the City of Phoenix. There are plenty of parking also.
For the real deal, the inside is spacious with plenty of good style seating spread apart. There are about 5 stories of books and media items you can check out. It is a general purpose library and not meant to be as specialized as a university library. Being a Library of Phoenix card member allows me to go to any of their 12 local branches to check out items and I believe they have an inter-library loan process for getting books from other libraries or US universities. Also you can browse their catalog online and I believe there is also free wifi in all branches.
For a general multipurpose public library, I can't ask for more.