While I enjoyed this book on the whole, the parallel structure of the protagonist's life was too neat and tidy. Did every event in Life A have to have a perfect mirror opposite in life B? This on the nose symmetry, which was almost never deviated from, made the narrative at times a little stale and predictable given the possibilities inherent in the premise. I would have appreciated some more boldness and creativity from the author in terms of plotting. Well drawn characters save it though.