After finishing the book, I think I mostly agree with arebelspy. It's fairly light, fluffy, and feel-good and pretty sparse on any specifics. At least it is a quick read, so if it's a waste of time, it's not a waste of a lot of time.
I need to try visiting the main metropolitan libraries here in Tokyo. I've read they have some selections of books in English but I suspect they'll be on the level of books you can find in a shop at the airport. Lots of Stephen King and John Grisham novels. Hopefully I will be wrong about that, though.