I will not rate this book for a simple reason: this is a technical one, pure history and facts and so it's hard for me to interpret that in terms of how much I liked it vs. how good it is.
The fact is: if you want an extremely good book about the SS for research, if you have an investigative thing going on, this is definitely the book for you. This is by far the most complete book I've ever read about this subject and I've read a few. The author talks about everything, every little single detail about the SS is in this book, the insignia, clothing, pre-requisites and of course, the man behind it, Himmler, For this fact this makes for an extremely dull read at some points, so I wouldn't recommend it as a recreational read, unless you're crazy (like myself).