I wasn't too sure about this one at first. I started reading it and had a hard time getting into the characters and what was happening in their lives. About a third of the way in I caught on and it was very interesting, not just the characters and the story but the IDEA behind the book - who are we really? Maybe I'm just at a point in my life where this strikes a little closer to home than for someone else, I'm not really sure. But I found this to be an excellent book and the ending was surprising...I thought I had it figured out and it turns out I had it partly right, but I was still a little bit off.
Overall I think this was a great book, and Dan Chaon is a brilliant writer...I will be checking out some more of his work!