I've read a lot of material written by Leroy Thompson. His books as well as his articles portray one perspective and the experiences of one executive protection agent.
If you're looking for anecdotal content and aeremainly interested in this subject in a general way, then you'll enjoy this book... & probably the other, similar titles. If you're looking form something that has more useful information on detailed aspects of the industry, then I'd suggest June, Oatman or even Lonsdale.
Why? Mainly because I've noticed that every single scenario described by Thompson seems to a security team with the budget of the average, developed nation. This book is no different. Perhaps every detail that the author has worked on has been like this... but it simply isn't the norm. I personally found it lacking in details on the boring & mundane topics of advance work, surveillance, risk & threat analysis, post orders etc.
Maybe this is exactly the type of book that he intended to author... but like his magazine articles, it strikes me as being closer to fantasy than reality.