I haven't read this one because I normally skip past horror and thriller genre (suspense makes my stomach hurt) novels, but I have an unreasonable fondness for This Perfect Day, an SF novel also by Levin, even though it has serious flaws.
Jo Walton wrote a review of it, and the first comment below it is from me.
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Jo Walton wrote a review of it, and the first comment below it is from me.