Enjoyed the movie but loved the book. It carries a lot more depth, asks a lot more moral questions of the reader, and develops the plot in a completely different manner and direction.
While I don’t think Deckard’s version of the earth will ever come to pass, it’s still a relevant book for all the questions it asks the reader about what defines a person/soul.
It’s also funny to see science fiction age, i.e. Deckard reading smudged carbon copies in a hover car, and using a pay video phone because no one has mobile phones.