My opinion:
Quick caveat -- I am primarily a FreeBSD guy. Since I started with FBSD, I've been using IPFW, which is a very excellent (if not uber complex) firewall implementation.
All that said, this book is the reason I decided to start using the (ported) FreeBSD PF. It's a great supplement to the faq/pf provided by the OBSD folks. The book is short, methodical, and contains relevant examples to get one up to speed on PF usage. It's also inexpensive.
To be honest, I read through the entire book by visiting a bookstore cafe several times. (Yes, I know that is not nice.) That may provide some idea as to how quick and readable this book is.
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