Custer once bubbled...
It's not "the DIR-F" book (DIR-F is a class), not a "rolling ad for Halcyon", and I doubt you've ever read it.
It's amazing the people that just prefer to be ignorant.
http://www.gue.com/catalog/order
"The Fundamentals of Better Diving was written for anyone who wants to get the most out of their diving. From augmenting dive safety to increasing the enjoyment of your family's Caribbean diving trip or planning deep cave exploration, DIR diving is the new foundation for all diving practices. This book outlines not only the essential skills and techniques constituting sound diving practice but also the central elements of a holistic approach to diving."
Don't feel bad, I'm sure there's nothing in a book written by one of the most accomplished divers in the world that you'd find beneficial in any way, Newdiver.
Custer, the paragraph you quoted above is the first paragraph in the Preface of the book ... and due to the audience JJ describes in this paragraph, I have one specific issue that I'll address a bit further on. But to address the advertising issue first, while there's a ton of valuable info in the book, it does in fact contain a great many plugs for Halcyon gear.
For example, on page 70 ...
"The Halcyon backplate and wing system is unique in its ability to accept single tanks without a single tank adapter." On page 72 (after spending the previous pages telling the reader all about what's wrong with other people's harness/wing systems and how to modify them ...
"Alternately, divers can avoid all these modifications and purchase a BC that is specifically designed for DIR, namely, the Halcyon BC."
Halcyon's canister light (page 96) and manifold (page 89) are also specifically mentioned.
While I don't take issue with JJ promoting his own company in the book (why shouldn't he, they're great products?) ... it's misleading to say that it doesn't happen.
Getting back to the audience specified by the paragraph you quoted ... if the manual is written for any diver, at any level, why does JJ bring up the practice of doubling up burst disks in scuba cylinders (page 62)? That's a patently unsafe practice for any but the most trained of technical divers (who have gained the requisite knowledge to be able to blend their own gases on their own compressors and have been trained to rigorously maintain their valves and cylinders).
Given the emphasis on diver safety thoughout the entire rest of the text, this particular topic seems noticeably disturbing (in the context of writing a book that's appropriate for the casual diver taking his family on a trip to the Caribbean). Not to mention that, in the USA at least, the DOT takes a rather dim view of people defeating safety devices mandated by federal law.
Honestly, there's a lot of good info in the book ... and I am glad I took the time to read it. But in all honesty, I think JJ does go out of his way to not only use the manual as a means to advertise Halcyon gear, but to also caricaturize other training agencies as a means to hype the DIR method of diving.
Again, I don't have any particular issue with him doing so ... but I think it's an honest assessment of what's in the book, from an "outsider's" perspective.
... Bob (Grateful Diver)