Ah, the 80's. A time when brilliant scientific geniuses fresh out of universities and doing their magic was cool rather than frightening and dorky. I have seen this movie before, when I was a child, and I remember the sense of awe I got from it, if nothing else. This time, the awe is just as real.
Most impressive for this movie is the construction. Ken Russel does a brilliant movie that grabs your emotions and twists them around. The soundtrack plays a great factor here, too. William Hurt is just wonderful, while the other few actors are just there to support him.
I can't say much about the story. I feel that in the context of this movie, it is irrelevant. I plan on reading the book, see what the author actually meant. It is not a horror story, either, although it is frightening at places; certainly not a monster and gore film.
Bottom line: the realization is great, the feel is awesome, the story highly intellectual. Something movies today pretty much lack altogether. You just have to watch this, but beware: people that are not fans of trippy sci-fi movies will only spoil your experience. This is one of the few films that must be watched alone.