It's my second year with PP unlimited plan. Works very well for me because their clubs are located in the terminals I fly out of regularly - no going through security twice. Since achieving Plat on AA, I added an Admirals Club membership and have been covered in every airport I've visited this year - with the exception of LAS.

Before making your decision, you'll want to have a good handle on your flying patterns and ensure that the lounges are easily accessible for you.