I picked up Vol. 1 today. Although I haven't read it yet I'll give a brief statement.
This volume covers Europe and Byzantium but does not cover the Arabs or Turks (supposably vol. 2 will do so). The bibliography is quite exensive with several French, Arab, Latin, and Greek sources.
There is a nice little section with a list of different terms in various languages; for example kar wa far (which you don't see very often). I also noticed a lot of 'correct' or 'actual' terms are used throughout the book, which I like.
I found a paragraph on the Turkopoles and sadly Nicolle still has the old stigma they are former Muslim troops. There seemed to be no additional research or acknowledgement from those who have conducted their own research and proposed alternative explanations.
He does acknowledge the mixing of troops; religious order milites with confrere milite (those who have not taken the vow of the order yet in their service) as well as sergeants.
I was not able to assertain whether or not this book will bring "fresh" material, however, it seems to adress some issues with less ambiguity than past materials.
I suppose the same question can be made about the second volume. I ordered this one, but may have to wait to purchase it. Nonetheless, I'll check it out when it arrives.
Chris