This movie (the theatrical version) got me interested in Dune and had a lot of memorable moments. Without having seen it, I would never have read the books, and left them to my one "geek" friend who liked them. Some parts of the book are realized very well in the movie, the sense of conspiracies, the flow of time and destiny, secret communication, thoughts, and so on... the use of sound. But in other places the movie suffers from being condensed so much and from some of the weirdness that Lynch put into it, like his over-the-top portrayal of Baron Harkonnen and grotesque heart plugs and some of the retro props and weapons. But overall, I recommend this movie. I'll never forget it.
The extended version, included here, is basically an attempt to dumb it down for TV audiences. They took every scene they could get their hands on and spliced them together, roughly in order, with explanatory voice overs. Some scenes are missing post production (blue eyes) and there are horrible continuity errors in sound and acting quality. Artistically speaking, the extended version is AWFUL. But die-hard fans might appreciate it for the extra scenes, and for a sense of just how far the director was trying to go in realizing his vision.