This is one of those shows that you wish hadn't been cancelled when it it was. I could have done with another 5 years or so worth of episodes!
For those not familiar with the series, think superheroes plus MacGuyver plus Star Trek mixed with a western/frontier kind of attitude... Cowboy Pirates in Space, as it were. The show has a stellar mix of comedy, drama, and action, and it actually made me want to watch TV again! (The reality show thing kind of killed it for me)
The DVD set is good, with 4 separate DVD's in 4 slimline cases in a slipcover for all of them. I would have preferred a slip or flip-out kind of configuration, since it's easier to keep up with all the disks and cases that way, but that's a minor detail, especially for the low price. The set includes some episodes that were never shown, as well as several behind-the-scenes features. Also, several episodes have alternate commentaries and deleted scenes.
Considering how many times I have rewatched these, I'd say this was the best twenty bucks I've spent in years! The content is 675 minutes worth in this set. Add a copy of the movie sequel to the series, "Serenity", and you have many hours of fun and joy ahead!