Unless you don't mind taking some time to think about a film, don't watch Solaris. I really enjoyed it, but not everyone likes having to work for their films.
Don't get me wrong. The film has a lot going for it: great visuals, nifty ideas, tense pacing, and good (but minimal) music. I think the look and style of the film is great. It conveys lots of careful craftsmanship.
Just the DVD's title menu completely hypnotized me. I would really like to have a screen saver that just featured an evolving view of Solaris and a loop of the score by Cliff Martinez. Of course, then I'd spend my days drooling into my keyboard rather than getting stuff done.
But the film doesn't end with an explanation of what just happened. You won't find any explosions or even any loud noises. We're talking about science fiction on the 2001: A Space Odyssey side of the genre. Events revolve around people (or at least characters), not around gadgets or dogfights. This is the sort of film that will keep you up for the rest of the night discussing what happened.
I think I'll put the Stanislaw Lem story and the 1972 film on my to-do list.