oh first off, its a great read and Harris is an amazing storyteller. But, the random format was not for me. Some parts where great but I am not a fan of jumping around in terms of timelines. However, the best part was Neil's 40th birthday and reading about it, knowing it took David over a year to plan (heard him say that in a recent interview), and Neil's reaction to it was just beautiful. 
 Son overall I give it a 4.5 out of 5.