To start with: there is absolutely no good reason not to buy this book. It's 99 cents and only about 1000x better than most of the stuff I've received from publishers as the "Zomg next big thing in YA". The story is action packed, the plot keeps moving and is constantly throwing you fascinating little curve balls. The choice of setting was such a pleasure (Thank God an apocalyptic story that takes place somewhere other than New York or LA!!). 
 This book kept me guessing, but more importantly 
 it kept me reading 
 ... even when I had a new romance in the queue waiting to be lampooned *lol* XD 
 That being said, it wasn't all roses. The dialogue was terrible. Attempts to be clever and witty had the author falling back on the same tired cliche quips you've read in thousands of other books. Every character sounded virtually the same regardless of age, sex, or metaphysical status. The only distinct voice was that of Penryn's would-be rapist, and that was only because he had "evil villain" speak instead of "bratty antihero". Because this is a first person narration the insufferable tripe of the dialogue does occasionally seep into the prose. At one point Raffe saying the Penryn's name for the first time is described "as though he is tasting something new, rolling it over his tongue to see how he likes it" and I want to stab myself in the face because I've read some variation on this line in at least six other books and a dozen fanfics. Enough already writers! It's not clever anymore. 
 Raffe later complains that letting someone touch his feet usually "takes dinner, some wine, and sparkling conversation" before hand, which again is a tired joke repeated practically everywhere. Use it once and I'll ignore it, but this same cliche is then repeated in a few more situations by different characters. 
 I'm on the fence about the characterization. On one hand I liked the characters, particularly Raffe and Penryn's mother. On the other hand I don't think their relationships to each other were all that well developed and believable. Penryn's attitude towards her mother feels more like she's dealing with a "desperate to be cool" parent than a unstable schizophrenic who may or may not have crippled her little sister. (view spoiler)[Raffe is supposedly a big campaigner against angel/human fraternization and yet takes to Penryn almost immediately, comforting her through a nightmare and protecting her from harm. At no point does he seem even the slightest bit conflicted about his attachment to her. (hide spoiler)] 
 There are a few inconsistencies that I may have to go back and investigate to see if I misread something: 
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 - When the cannibalism thing first comes into play, Raffe tells Penryn the attackers have flat teeth. He's insistant about this and it's presented as evidence that the bodies have not been attacked by animals. Later the monsters are described as having razor sharp or needle like teeth....? 
 - The description of Night Angel's wings in the beginning of the book is way too subtle given the significance they have at the end of the book. They're described as having a "different shape" ... nothing about them being bat wings instead of COVERED IN FEATHERS which I imagine is something you would notice ... even in the moonlight. This made the finale confusing to read. 
 - Why did Penryn never think to ask Raffe why the other angels had attacked him? That would have been question number 1 for me both because it was interesting intel and because it would help her figure out how best to work Raffe in order to get him to help her. 
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 All and all pick up the book and decide for yourself. It's definitely not something you will regret buying.