Well, this is not a book about DevOps as it is a book about Value Stream Mapping, even though they are intertwinned.

With that said, the only major criticism I have is that it is too detailed, which some see as bad and others as good. Granted, it manages to get into a lot of finer details that you may find useful, it is a daunting read.

Anyway, if you are interested in the topic, I would gladly recommend this book.