We started signing up for the Jr Cyclone Club when ours were ages 3 and 4. It's been a blast so far.
The primary motivation for us to register for the JRCC was obviously cheap football season tickets for the two parents, and a place (the hillsides) for young kids to move around during the games. At the time we weren't in a position to even think about forking over donations for more expensive season tickets, though I would argue hillsides have had a better game experience and view than most other season tickets.
It's been a good perk to enjoy a few gymnastics and wrestling meets throughout the year too.