Passport America, worth it or not?

We have Passport America in our arsenal of discount cards, and it more than pays for itself each year. The various park restrictions and locations may not fit your travel "style" though, so make sure you check them for your typical trips before joining. PA parks are typically either in non-destination areas or only discount in the off-season or on off-days, etc., since the purpose for them is to fill otherwise empty sites and make some money rather than none for those sites.