Since you already have the insurance and towing, it may not be as important to you. I had them for a year. Liked the camping discount (although only offered at maybe 1/3 of the parks where I stayed, and those were covered by another group to which I belong). Hated the constant parade of junk-mail to buy everything from books to more insurance to renewing my membership "now" (huh? Only been a member for six months and you want more money?) They do publish a monthly magazine, but I found it very generic and it seemed like they never met an advertiser's product that they didn't like. Personally, I allowed the membership to lapse. It took another six months, four letters, and a half-dozen or so phone calls to get the junk mail to cease.
They do hold get-togethers ("Samborees") and have chapters in various parts of the country, if that's something that interests you. Just depends on what your objectives and expectations are.