I'm glad somebody else on FilmWurld has seen Primer, but sorry you missed the keen sense of excitement and discovery watching this movie gave to me and has given to others.

I saw the movie twice myself, in the theater, and I too found that the second time only made me more aware of how mystified I was by the last part -- not I think the "fault" of Primer so much as of my lack of science nerd and puzzle solving skills. There was too much along the way that I had not picked up. Still, there's both a deliberate element of mystification and a given element of improvisation and confusion in the filmmaking process.

You may choose to "file under curio," but I’d file under “in a class by itself” and “diamond in the rough. " Filmmaking is what Shane Carruth wants to do, he's got talent and lots of ideas, and we're going to see more from him. His next project is something quite diffrerent, "a coming-of-age romance between an oceanography prodigy and the daughter of a commodities trader...set against trade routes in East Africa and Southern Asia." See the Amy Taubin interview on the Film Society of Lincoln Center interview with Carruth http://www.filmlinc.com/fcm/artandindustry/primer2.htm

Whether you will eventually come to like his style or not, I don't think he's going to be a flash in the pan. So keep that file open.