KC,
The best DIR text far and away is the little book called "Doing it Right: The Fundamentals of Better Diving" by Jarrod Jablonski of the GUE. You can buy the book for $24 from the GUE.
http://www.gue.com/classroom/manuals.shtml
Trust me, this book is not intimidating, condescending, or rude. It just explains the thought process that went into developing DIR, and why it works better than what is often taught in OW classes. It *does* make a lot of references to Halcyon gear -- but it also makes references to Apeks and DiveRite and other gear, too. It's a relatively short, easy read, and is very informative.
more of a sales pitch for a certain type of gear
I will admit that DIR and Halcyon are intertwined; however, they're intertwined in a good way. Some people assume that Halcyon made up DIR to sell their gear -- the truth is that DIR was created over time by cave divers, especially such teams as the WKPP. Halcyon was created much later to fill the market opportunity to develop gear specifically targeted to DIR. Halcyon makes a lot of DIR gear -- they also make a few things which aren't DIR. A lot of other companies (like DiveRite) also make gear which is applicable to DIR diving. In fact, I dive DIR, but the only Halcyon item I have is a pocket that I can hang on my harness. I think it was a bad decision on Halcyon's part to use the words "Doing It Right" in their logo, but, well, DIR isn't a copyright, and isn't owned by anyone. Using "Doing It Right" as a corporate moniker isn't much different than using "DiveRite" as a corporate moniker.
Keep in mind as well that DIR has a LOT to say about equipment. In fact, it has so much to say about equipment that many people mistakenly identify DIR as just a different equipment configuration. In reality, it is much more -- it's a set of standards and protocols (for gas mixing, gas switching, scootering, surveying, handling emergencies, signalling, you name it) that have been carefully and critically engineered together to be the safest possible diving system (using technology available to recreational divers).
It is true that you cannot be DIR with a normal jacket-style BC -- it's also true that you can't be DIR unless you have a particular type of fin. Many people get hung up on that, and it leads them to believe DIR is a marketing gimmick. If you like your jacket-style BC, that's perfectly okay -- it does mean in the
strictest sense that you are not DIR -- but it doesn't mean you're not safer for having considered all the things that DIR considers. You can learn and use DIR's signalling, trim, propulsion, and other techniques without having a stitch of "DIR gear," and you'll be a better diver for it. Keep in mind that DIR is highly directed at overhead technical diving -- where jacket-style BCs are contraindicted -- but if you're doing open-water diving, a good jacket-style BC is a concession that many DIR divers would be ok with.
Like many other, I have been turned off by the attitude and demeanor of most of the DIR divers that I have met.
Despite the common misconception that DIR = attitude, most DIR divers (all the ones I hang out with, anyway) would applaud anyone for thinking critically about their diving, even if they choose some path other than DIR. Unlike many people, I believe a diver can adopt subsets of DIR, and be a safer diver for it, even if they choose not to adopt everything about DIR. This is the way I started out, as well -- picking and choosing. Gradually, as I outgrew my gear and bought new gear, and moved up to more challenging dives, I became pretty much 100% DIR -- I'm very happy with my diving now.
I believe in continual learning and growing in the sport of scuba but I don't think that I will ever subscribe to the idea that there is a single right way to do it.
In open water, shallow diving, there ARE many ways to do it right. In overhead wreck, cave, or deep environments (where DIR focuses its attention), however, the number of choices decreases markedly. In 20,000 foot cave penetrations at 300 ffw, there really is only one way to do it right -- that's where DIR began. Perhaps the name is justified there.
- Warren