2.5/5 
 Replica was one my most anticipated releases, but it was pretty much a let down for me. The idea of both two books in one and a book about cloning had so much potential, but this book failed to live up to it. I understand the marketing strategy behind promoting this book as two books in one and splitting it into two parts, but it did not feel like two books to me. Each perspective felt like half of a story, and reading the other did not make me feel any more satisfied, because it was basically the same half told from a different perspective. Each part was only around 200 pages, so it isn't surprising that they felt this way. It would have been better if it had just been told in alternating chapters, without overlapping scenes. I know they did the half-and-half style to make this book stand out, which it did, but I think it was detrimental to the overall story. 
 Another issue I had was that I failed to connect with the characters, probably because of the issue of shortness I mentioned above. I liked Lyra and Gemma well enough, but I really couldn't bring myself to care about them. I found myself skimming the last few chapters of Gemma (I read Lyra first) because I felt like I already knew where they were ending up, and I didn't really care enough to get the full story. I feel like the writing style made me feel disconnected from them as well for some reason. Also, Lyra and 72's relationship was so insta-love. They barely knew each other at all, and each was the first male/female the other had seen, and yet they decided that they were in love by the end. I could have liked their relationship if it hadn't been so rushed and forced, but it was. I liked Gemma and Pete's relationship slightly more, though I also felt like it could have benefited by being slowed down a bit. 
 Overall I didn't hate this book, but I had a lot of issues with it. I probably won't be picking up the sequel. I feel bad rating it so low, because I usually love Lauren Oliver's work, but this one just didn't do it for me.