I was a Computer Arts subscriber for 2 years. I learned all sorts of things, from how to set up an augmented reality webapp, to creating efficient patterns in Illustrator. The new talent and agency features were also great, as I could see what others in the industry were working on.
I decided, though, to cancel my membership. The magazine had a serious lack of diversity in its pages. There were hardly ever any designers from South America, Asia, Africa, or 'other' design communities. The same few people were featured constantly, month after month, and I just got tired of seeing nothing but white European faces.
The design world is bigger than that. I wanted to also read about agencies in Lagos and Accra, translated interviews with Colombian designers, and tutorials from Indian typographers. I wanted to learn, not only about what has been in the design news, but what others were doing around the globe. That wasn't in the pages of Computer Arts, so I cancelled my subscription.