I saw this movie at a pre-screening that io9 had in SF. It is wonderful. The story is amazing, but I really enjoyed the way that Jodorowsky worked with the people who were his "spirit warriors" to create the vision of Dune. He really inspired the artists and painters who created a world that was never realized in his Dune, but was used by other movies and gave us some iconic worlds.
I also really enjoyed how he worked with the people like Foss, and O'Bannon. The acknowledged how he inspired them and encouraged them. That was something that they both really appreciated. How often do the artists get that in their lives.
The movie is best to watch for Jodorowsky. Tremendously enjoyable man. I will say there is one "diction" choice near the end of the film that was really bad, but given that the rest of the movie I think I understood what he was going for.