I have studied Military History for quite some time, and have always wanted a "quick reference" book for each figure in history. A lot of times, I will be watching a movie, and they will mention "General whoever" or another figure, and I jump up, grab this book, and read a brief history on the person involved.
This book is excellent in that respect. Do not buy this book for an in depth look at different personalities of military history. However, for a quick reference, this book cannot be beat. It is quite extensive, and seems to be unbiased in it's opinions of the people involved.