I have to say that after the amazing ride of book one, I did feel this one sagged quite a bit. I really think we went away from technology and advancement and spent way to much time of personal stories. at one stage it just felt like a big long chase scene that really felt like it was a mode to get to the end story. 
 A few days after reading it, I am trying to explain to a friend all about the story and to be honest, everything I am spouting is in book 1. There isn't much that I think advanced the story enough to discuss as highlights. 
 Don't get me wrong, I still gave it 4 stars, albeit in a 3.5 kind of way. But it is definitely suffering from the brilliance of book one.