I’m a great fan of Lem, but somehow haven’t read Solaris yet. My favorite books of his are The Futurological Congress and The Cyberiad.
I read that even though Lem respected Tarkovsky very much, but he simply couldn’t stand the movie. He thought it wasn’t even decent. Reportedly Tarkovsky wanted to add some new characters: uncles and aunts and Lem almost went insane. Eventually he called Tarkovsky an idiot and came back to Krakow. As far as I read, Tarkovsky wanted to show the viewer the whole beauty of Earth, the coldness and indifference of space, while Lem intended to fascinate readers with all mysterious places that Cosmos covers in its darknesses.
I really like Tarkovsky’s Stalker and in spite of rather negative approach by Lem towards Tarkovsky’s movie, I’m sure I’ll enjoy this one. Tarkovsky is certainly a remarkable filmmaker with a very interesting eye for visuals.