Replay

Really a 5.5/10. Well done and everything, but strikingly unoriginal. This type of story is part of modern culture, sufficiently similar to Slaughterhouse Five (1969), Groundhog's Day, and The Time-Traveler's Wife. This version is probably the weakest out of all of them, despite being the most different. For instance, the romance in The Time-Traveler's Wife was extremely potent, markedly distinguished from the matter-of-fact relationship in “Reply”.
Not terribly recommended, except if you literally run out of all other books. Was surprised to see it included in the Fantasy Masterworks collection.