Tarkovsky's works are generally demanding works of art. They are definitely slow paced and almost boring, but I've always found myself in a much more thoughtful frame of mind after watching his films.
As for Solaris, it is worth reading the book as well as watching both versions of the film -- they ask and explore different questions. The book is about the nature of intelligence and life whereas the films are more about the human part of the equation -- what does it mean to be a human as opposed to be a "replicant"? Tarkovsky is slower paced, but IMHO encourages deep reflection. Soderbergh's version is definitely more watchable and is actually quite thoughtful by Hollywood standards.
As for Solaris, it is worth reading the book as well as watching both versions of the film -- they ask and explore different questions. The book is about the nature of intelligence and life whereas the films are more about the human part of the equation -- what does it mean to be a human as opposed to be a "replicant"? Tarkovsky is slower paced, but IMHO encourages deep reflection. Soderbergh's version is definitely more watchable and is actually quite thoughtful by Hollywood standards.