Listened to this as an audio book and it was a very quick and easy read, I enjoyed the premise a lot, about how one choice leading to one event could so quickly split how the main character's life turns out. 

It was good that neither universe was portrayed as the bad one just a different path and both had their negatives and positives and both left room for more choices that could have led to different things. 

I do have critisims of this book which would be considered mild spoilers so I have given this a 3.5 I just didnt find all of Hannah's choices believable and I think that might be a difference in UK and US culture surrounding the issues contained in this book.

I also found her a bit flighty and frustrating at times. 

I enjoyed this book enough, but i dont think it's one to write home about, I can't see me returning to this one but I do enjoy the writing.