What I liked: 
 How LaZebnik portrayed two different autistic characters (and how she portrayed others' reactions to them). I though she did a phenomenal job with this. Ivy and Ethan were both autistic, but still different. They weren't portrayed in a stereotypical way that tends to frustrate me and make me angry. I also appreciated that the other characters in the book had varying reactions to both Ethan and Ivy. While some of the reactions angered me (view spoiler)[Ethan's stepmother was concerned her new baby would "catch" autism. (hide spoiler)] they were also realistic. 
 What I didn't like: 
 I felt like it just kind of ended. 
 Sometimes David and Chloe drove me nuts.