(I won this book from GR's First Reads in February 2010.) 
 I'd be the first to admit that I'm not a big fan of the young adult genre. I entered to win this book from GR's First Reads drawings because I had hoped it would be an exception. And it was. The book was clearly a young adult book -- no one could argue that -- but it had so much more to the plot that made me enjoy the book regardless. I apologize in advance for being overly critical in this review. I know I tend to focus more on the negatives than the positives. But really, I did enjoy this book. 
 I really liked Gemma's character. She was easy for me to identify with and well-written. She fought many of the same emotional battles that I've fought, and am still fighting, and she came out victorious. Ty's character wasn't too bad, either, but not as identifiable. Gemma and Ty had sort of opposite battles, though, with Ty trying desperately to be "normal" and Gemma fighting to be something "special." So I guess it would be difficult for one reader to be able to identify with both. 
 Unfortunately, most of the other characters -- except Shade, Zoe, and maybe Hewitt -- seemed to be very 2-D. (I guess you'd be hard-pressed to find a book that didn't have at least a few of those, though.) 
 I also liked the descriptions. They gave the reader a beautiful picture of what the characters were seeing, but didn't interrupt the story. The description of (view spoiler)[Ty's sonar vision (hide spoiler)] was okay, but I didn't see why the description of this suddenly changed (view spoiler)[from "I saw the object" to "I sent out some clicks and found the object" (hide spoiler)] halfway through the book. It was, honestly, a little annoying. I mean, we know already that this is something special, the writing doesn't need to hit us over the head with it. 
 Also, there were several questions left unanswered at the end of the book. I know that this is the beginning of a series, and hopefully the next book(s) will answer these questions. But to be honest, most of those had taken place a while before, and by the end of the book, the reader just isn't very curious about them anymore. For example, (view spoiler)[what exactly happened at Seablite? What did Doc actually do to the boys, and why did he do it? (That's the main question.) How did the boys break out? Why are they raiding government ships? And finally, what happened to Doc? Did he die? (I'm gonna guess no, just because that would be so typical -- not necessarily a bad thing as most of these archetypes have been used over and over for a good reason, but it is unfortunate that it's so predictable) (hide spoiler)]. 
 The last thing I can mention that annoyed me was that it seemed that all the action was happening at once. The entire book (minus the epilogue) took place over, what, three days? Four? I mean, Ty is in what he believes to be a life-or-death situation on the first page. Then, another one three pages later... and again less than ten pages after that. The total timespan of this sequence being about ten minutes. This is typical of young adult literature, though, so I can't fault the author for this. But I personally like more time to get to know the characters, without that having to take a backseat to the action. 
 Overall, though, it was a very good book and I would definitely recommend it to people I know who like YA lit.