Awaken is a very interesting idea, one that could very easily become true. The idea that humans could cut themselves off from the world completely isn't that difficult to fathom - after all, we've been doing it for years, slowly but surely. Madeline is a very interesting character, you see her rebellious side a lot but fear of her Father stops her from doing anything he might dislike - he doesn't trust her due to something she did in the past. Justin was my favourite character as his history was rather complex. Justin encourages Madeline to fend for herself and fight for what she believes in, so he's a crucial part of the book.
For me, I didn't like how it ended. I was expecting/hoping for an Uglies style cliff-hanger but what I got was a pretty ending tied up with a pretty pink bow. Otherwise, this book was perfect.