I guess it depends on your needs. Community forums are a great resource for asking questions, getting code snippets, and other person-to-person support. PEC (or eLearning, or whatever it's called these days) provides a structured curriculum that you won't get from a community resource. So if that style of learning suits you, and depending on your current level of knowledge, then there may be value in it for you.
It's worth noting that a PSDN subscription includes a registration for the eLearning site. So that's a bonus if you can justify the cost of PSDN.