Good Sam used to be a REALLY GREAT club... not so much after Camping World took it over. We are life members and use the Pilot fuel and propane discounts, and the 10 percent off at campgrounds. However, in my opinion, you can get better road service from AAA RV, and better campground discounts from AAA and KOA.
I no longer trust Camping World to do service (after a bad experience), and can get better prices from the eBay RV Stores than from CW.
So is it worth joining Good Sam... If you going to join a local Good Sam Chapter and participate in their events and go to the Samborees, then yes. The fellowship, fun, group camping outings, and get togethers are great. If you're not going to participate in those aspects of the club, then I would say no, isn't worth it.
What ever you decide, have fun and be safe!