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Robert A. Heinlein said, "It belongs on the same shelf with 1984 and Brave New World," and the Los Angeles Times noted, "In the literate tradition of Huxley, Orwell, and Bradbury, it is a work of extraordinary impact." Joanna Russ, in her review of the book in 1969, was highly critical, writing "I forgive Mr. Boyd the anguish his novel caused me and hope he will eventually forgive me the anguish this review may cause him, but for Berkley there is no forgiveness. Only reform. Don’t do it again." Spider Robinson, however, praised the novel as "delightful, with a rigorously consistent internal logic that doesn't really become apparent until the very last chapter.