I'm so upset that I didn't like this book since this series has been on my TBR for a long time. I went in not knowing a lot about this book, only that it had something to do with cyborgs and being a retelling of Cinderella. I didn't even read the inside of the dust jacket. But, even though I don't read Goodreads reviews before I read a book, this book/series was always in all the booktube videos I watched. So here we are. 
 To start, the world building. Nothing about it interested me. Even if the building had been in depth, which it very much wasn't. We got a few basic descriptions on where the countries stood at that point in time, but it was all very info dumped. 
 None of the characters were enjoyable. Cinder herself was annoying and changed how she felt about certain things in a *blink* of an eye and didn't really think a lot of things through. Someone would explain something to her and she would think about it for two seconds and than jump on board. Pearl was very one dimensional and nothing she said was really explained? We're left to assume that she acts the way she does because of her mom but meh. Kai was the only one that I /kinda/ liked. The romance in this book wasn't COMPLETELY insta-love but damn. It was close. It feels like Meyer tried really hard to fit so many chapters in the middle so it wouldn't be called insta-love. I had no attachments to any of the characters at all. 
 I feel like the writing would've been so much better if it would've been told it first person, from both Cinder and Kai's POV. I feel like with first person POV, connecting to the characters is a lot easier. The third person POV in this book is really what killed it. 
 I honestly feel like this book was too short for what it was trying to do. 
 One of the biggest issues I had with this book was the plot twist. I can usually think through plot twist a few chapters before they happen but this was just...ridiculous. Clues to the plot twist were way to obvious, throughout the whole book. 
 The only reason that this is a two star read and not a one star is because of the only thing I liked out of this entire book: the Lunar part of it. I really liked learning about them and what they were (at least, what little was told about them.) 
 All in all, I'm just really disappointed in this book and I'm not really sure if I'll be picking up the second book in this series. And, even if I do, it won't be anytime soon.