I was very glad that I spent last weekend watching the bonus features from these X-MEN movies. It saved me hours of time tonight. True, there was still a 2-hour documentary that was on the X-MEN 1.5 DVD set that I never bought, but I had seen most everything else.
My god, these Blu-rays are so interactive, and there is just TOO much content on them. The film and that two hour documentary can be played in "enhanced" form which features branching featurettes on many different subjects that stop the main feature cold and branch off into sideline topics. Thankfully, they also list the branching vignettes so you can watch them separately and not interrupt the flow of the main features you're watching.