I joined 1 1/2 years ago and found the first year's subscription extremely helpful for the article archives. There are lots of good ones from prior years, particularly the ones on technique (such as the ones about techniques for cold, wet weather). I didn't really learn a lot of new things except that it added organization and some new concepts to what I was doing already. I trimmed about 3 lbs. off my base weight, but have since added half of them back because I need them for my personal comfort level. Still, that's 24 oz. that I no longer have to carry!
I've found very few of the current articles to be of interest. However, I did renew last fall because I was offered a half-price renewal. I may not renew again. And I have this prejudice that information offered on the internet should be free, although I do make small donations to the free sites that I use a lot. Despite that, I strongly recommend getting a one-time membership for access to the archived articles. Even the oldest are well worth while.