Instruct: Classify a review as either positive or negative.
Query: be warned

i was very disappointed in the book, and amazed that it won a nebula. the science fiction aspects are minimal and mainly related to near-future waste management methods. the narrative borrows split-time techniques developed and far better utilized by many others. the story line is obsessed with graphic lesbian encounters. perhaps i was spoiled by having read 3 phillip k dick classics and gene wolfe's masterpiece "the fifth head of cereberus" before this, but this seems like a minor work of limited interest and a short shelf-life. spend your money and time elsewhere. be alerted: several aspects of the book are frankly explicit.