Whether it's worth it or not depends entirely what you want from your membership.
I'm just starting to plan a 450 mile walk from Englands most easterly point to Wales most westerly point and I'm basically using their sites all the way. Why? I know with total reliability I am going to find generous pitch size, clean warm sanitary blocks, nice showers, laundry's that work, 16A EHU and spotless surroundings.
I don't care that the sites appear to have a lot of rules and that they look regimented. I know the reliable product that I am getting.
That's just the camping side. Both clubs also get some cracking offers together.
If I wanted 18+ then not for me. If I wanted to be very private, not for me. If I wanted to pay less than a fiver, find a car park instead. If I wanted bars, swimming pools and pizza ovens, not for me.