This book is the second part of Codex Martialis Weapons of the Ancient World. As for the first part treating weapons (link : http://www.drivethrurpg.com/product/63628), the book has a high level of quality in content and in historical illustrations.
There are numerous myths and clichés about armors ... the author tries to get rid of them in a scientific historical kind of approach. And though the book is very complete and well illustrated, it remains practical to be used or at least transposed to any RPG.
For my part, I also like it as an historical source of knowledge about armors.
I gave it 5 stars for the content (I really do not miss my 10 dollars).
(french mother language, so please excuse my poor english)