The first ECW: Unreleased is on Netflix streaming right now. It's quite good. I'm sure the next one will be as well.
The Triple H biography will probably be a total waste of money and time. I'm sure there will be maybe 30 seconds of the film dedicated to glossing over his relationship with Chyna, and will not discuss how he's basically been booking himself unmitigated for the last decade.
Mick Foley Biography on the other hand. Well, let's just say I'll wait to hear Ric Flair's review of it before I buy.