|Have been using Passport America all year.
We are Full Time Rving, but the pass pays for itself basically the first time you use it.
Yes you are correct PA gives you 50% off at the parks you stay at, just be sure to check with the campground because sometimes on holidays and special events they do not accept it.
As for the campground quality, I always check on http://rvparkreviews.com/ to see how they are rated. If they have a good rating then I will book with them and have not had any problems yet.