My full review is here on my personal website. I'll post a few excerpts here, though:

5.0 out of 5.0 stars

The very worst thing about this book is the way it ends. We’re left not quite knowing whether Jonas makes it. Maybe he’s hallucinating? Maybe he’s not, we don’t actually know.

The very best thing about this book is the world, the details, the story! Everything! I can’t think of anything, other than the ending, that I don’t like about this book. And of course, since this is actually just the first in a trilogy (which I wasn’t aware of until a few years ago even though I had read the second book), the ending is excusable. :-D I think this was the first dystopian book that I ever read, and I’m glad for that because I truly enjoy the genre.