I really recommend to you to get silver (or at least bronze). PS.com material (article, video, and hand analysis forum) are very good. In my opinion Silver is good enough till you reach NL25. The study material is not new. We can get similar contents by searching via google, but in order to do that we have to spend many hours sorting many amount informations. I do this in the past. I remember when I search about a topic, browsing/skimming many articles only to find it that these article contradict each other.
In short, by joining with PS I no longer need to visit other places and I can learn in a more structured path. And it's very cheap. Just deposit a minimal account to a site and we get bronze. You can save the free bankroll as future choice in case you need it. Actually, I think the free bankroll is not too valuable compared to the material contents. I'll join PS even if they did not offered it. Oh, and the hand analysis forum is the best on the net.