We used passport America all winter and recouped the cost of the membership about many times over. 50 percent discount is substantial. The membership was 44 dollars, and we saved 30 dollars in one night at many places. We found that you had to look up the individual RV website to find their restrictions on the PA discount. Some wont accept it in the winter, some wont accept it in the summer. Some were only good Sunday to Thursday. Some were only good for a maximum of two days. Every park was different. If you plan on travelling a lot to different parks, you could save far more than the cost of the card. If you are only staying in one place, chances are you wont see much of a return. We also had good SAM, and AAA roadside assist. We used it last year to change a tire, but this year only to get discounts on RV parks that didn't take passport America. Still saved 10 percent with either of these cards. We also bought the National parks pass for 80 dollars, and got far more than that back. You wont miss a park if you don't have to pay any additional money. We travelled close to 20000 miles in two winters, so we saw a lot of national parks and monuments.