Wonderful film. More or less just repeating what I've said elsewhere, but this and the Makers films before them are a real blessing to our community.
Other franchises have documentaries that are controlled by the studio that focus on only the director, and some of the stars usually. We've got that now, plus some that focus on the other guys, the guys that worked and toiled doing all the amazing things that made Alien seem so real to us, both then and now, and they weren't controlled by the studio, so there was no censorship as to what was said (I'm looking at you, David Fincher...)
And a documentary about the fans? I mean, sure, there was Trekkies, but that was more of an exercise in "look how weird these people are" rather than a celebration of why they were fans. Alien Fans is a truly unique film, in that it manages to take all these people from radically different backgrounds and situations, and boil it down in 90 minutes to just what makes Alien such a special and enduring film, and what makes everyone here love it so.
Also, that ending was fantastic.