Can't remember what drove me to get this book but it sounded intriguing. I've never been to the Mission Chinese restaurants but I enjoy the stories of cooks, chefs, etc. and thought it might be a good read.
Part-cookbook, part biography, part interview with Danny Bowien, Chris Ying and some of the people they've worked with, etc. the book itself is trying to be too much of everything without being any one thing. I think I was under the impression it was more of a cookbook/biography of Mission Chinese itself (as in the restaurant but not necessarily the people behind it).
There are some really gorgeous pictures (the book itself also has a nice picture of a dish on the front cover) but I wouldn't be compelled to make any of the recipes since I am not the type to put in that effort and would trust the experts a lot more. I also wasn't all that interested in either of Danny or Chris (or anyone else's!) stories in the book.
Based on Yelp reviews it seems to be they found some sort of way to make Americanized Chinese food/Americanized Asian fusion food, etc. into a "thing" which is odd because it's not a new concept.
As you can tell, I don't get the hype. Skip it unless you really like the concept or like cookbooks.