If you imagine having an informal chat in the pub with a successful director/producer, that's a good description of this book. There is always the chance of coming across a real nugget (or possibly two) of really useful information, to be fair I think that's the best you can hope for in this book, and that of course will depend on what you're shooting and your level of experience.
You will of course probably also have to listen to a fair degree of them on their soapbox (keep your camera lens clean), or reminiscing about the good old days (Super 8)! There is a fair bit of that in this small, brief (156 pages in a pocketbook format) book in fact you could probably remove the first 29 pages (chapters 1 & 2) without impacting the book, plus several sections in later chapters as well.
Bits of the book talk to those starting out and other bit's to those who are about to embark on large productions. That's common in books like this (particularly when written by people who now teach, like Figgis), and for me at least, it doesn't work all that well, no one book can be a one stop shop, they always come across as too general.
All that being said it's a quick read and pretty inexpensive, would I put it on my must read list, well probably not.