The only thing missing are extras. The first two volumes had no extras and these have none either. It’s great that X-Men are finally out on DVD, and they will make their way into the fans' homes, but it would be nice to have some of the cast talking about their time on the series, some commentaries, or interviews with the creators of the X-Men stories that were adapted for the show and their thoughts. The fifth DVD set, when it’s released, should contain the final 14 episodes and we can hope that the producers are saving the extras for the last set.
That said, I’m glad that X-Men are finally on DVD, I’m looking forward to getting the complete series. Now if we can just get the Spider-Man series from the '90s that aired on FOX, I’d be a happy fanboy!