At least read the first 20 pages. An incredibly clear, insightful thinker. He was an utter perfectionist, he worked on the book for decades and died with it incomplete, but the beginning in particular is precisely accurate and insightful like almost nothing else I've read.
If you like the Art of War at all, you simply must read von Clauswitz's On War:
http://en.wikipedia.org/wiki/On_War#Synopsis
At least read the first 20 pages. An incredibly clear, insightful thinker. He was an utter perfectionist, he worked on the book for decades and died with it incomplete, but the beginning in particular is precisely accurate and insightful like almost nothing else I've read.