I was a member for a few years. If you like the magazine and think it is worth $12 a year for the magazine, I say you should join. But don't be enticed by all of the other gimmicks they offer like field testing gear, free gifts, etc. You will most likely rarely be chosen to field test anything (I think I got to field test 2 things in the several years I was a member) and the stuff they send you is usually junk (I think I got a sample size bottle of sunscreen that claimed not to repel fish... they sent me this both times I field tested anything), yet they advertise that they send members kayaks and rod/reel combos to field test. Also be prepared for them to pester you about becoming a life member and all of the "benefits" you will receive. They kept sending me stuff for a good year or two after I stopped paying for my membership, asking me to renew my subscription and become a life member, etc.
Bottom line: If you like the magazine and can put up with the gimmicky/annoying stuff they pull, then I think it would be worth $12 a year... seems reasonable for a subscription to a magazine that you will enjoy.