As I was reading this I knew the story wasn't amazing but John is such an endearing character that I found myself interested in where the story would take him. I just wish there was more action through out the book. The only really big action sequence was at the very end. It made the story's pacing seem... off. It was a whole lot of mundane and then... A GIANT EXPLOSION OF ACTION! 
 As I mentioned, John is an endearing character. He's the kind of protagonist that you really want to root for. He's 15 and I just really loved how honest he was about being goofy about girls, Sarah in particular. Its pretty adorable. Speaking of Sarah (view spoiler)[ she was super ok with John being an alien immediately. Like "Oh, we're different species and you have super powers... Cool. Let's make out, I love you." I think if she took a minute to freak out about the whole thing it would have been understandable. Then her being ok with the whole thing would maybe have seemed more accurate. The fact that she was just immediately cool with it seemed unrealistic to me at least. (hide spoiler)] 
 Ugh... that ending. MY EMOTIONS! (view spoiler)[ Henri's death scene. Got to admit I cried a bit. It was a rough one. Maybe because I was so invested in John, his despair got to me. (hide spoiler)] 
 Overall, I like John enough to continue on with at least another book in the series.