I think this might be the best book in the series so far. From what little we'd seen of Cress in "Cinder," I was afraid she'd be a really annoying heroine, but she was actually pretty endearing. She was a nice change of pace from Cinder and Scarlet, who are so similar to each other I often forget which one I'm reading about. 
 Speaking of potentially annoying characters, Thorne is a lot less annoying in this book. He actually turns out to be pretty charming (his disability made him more likable, I suppose) and the semi-relationship between he and Cress is adorable. 
 It seemed like more got done in this book than in "Scarlet." The time was divided kind of awkwardly between characters at times, but that's just a side effect of having so many characters in a story who are separated from each other and off doing their own thing. I think that was about my only problem with the book, and it was a very minor one. All in all it was a great installment in the series, and I can't wait to read Winter!