George Lucas said many times that one of the biggest inspirations for the Star Wars was Dune (just the book) and 14 years after the first star wars were released, the Dune was being transfered from the book to the movie screen.
I warmly recommend it for all the star wars fans and also for all the sci-fi fans. I will not talk about the story itself because it is truly spiritual father of star wars, you´ll see dozens of similarities with the star wars story.
Considering the age of the movie the effects are still decent so it will not hurt your eyesight. Briefly this is a cult film that you must see if you are a sci-fi fanatic.
Runtime: 2h 17min
more at IMDB