I "rent" a seasonal site, kinda like leasing the spot for the season, but in no way does it prevent me from going to whatever campground I want, when ever I want.
What it does allow me to do, is do short one night camping trips without the need to pack the TT and TV up, which I can now do in the car and $20 in gas.
With a family of 5, it will make packing and life quite a bit easier. It's really nice to have the kids toys sitting there waiting to keep them occupied, not really an option when your going from campground to campground