I spent a good bit of my work day on Saturday in the American Airlines club on the B concourse of the Phoenix airport.
The lounge is one floor up in the terminal between gates B5 and B7, and is one of three American clubs in Phoenix (the other two are on the A concourse, one of which is currently closed for renovations.
The staff were exceptionally friendly and welcoming. The only negative I’d offer is that as legacy US Airways employees they are working off of a much more automated version of the airline’s reservation system than some legacy American agents — so they may not be able to work some of the miracles during irregular operations that I’ve experienced in American clubs in the past.