One thing that I haven't seen in reviews of this book so far is the fact that it deals heavily with suicide and death as topics. If that's something that's going to be upsetting for you, I think I'd advise steering clear of this one. There is also a scene with a sexual assault that's difficult to read and (imo) not very plot essential, and a couple more scenes with dubious sexual consent. 
 That said, I really did not expect this book to get into idea of quantum entanglement and multiple worlds, but it went there in the service of a really interesting narrative about the relationship between author and story. However, I think that idea could have been developed. As it is, the more metaphysical elements kind of pop out of nowhere halfway through the book and rush to the finish leaving you wondering wtf was actually happening.. 
 I listened to this as an audiobook, read by the author herself, and I was impressed by the amount of feeling and fun that she was able to instill into the text.