I have.
It's by far Poole's best work - and is still actually pretty good. A lot of the language is a bit dated, there is a lot of "Poole" baggage, but it's in the top five of works of this type2) What did you think of it?
Not sure. I'd see it as being mostly military, but you will not suffer from having read it. I'd buy it.3) Is it a worthwhile read for police officers with things like active shooters, baricaded suspects, high risk warrant service, etc., in mind (Common sense and gut hunch says that it would be just for principals, but I want to know what people who've read it say).
Bookmarks