I'll add my 3500psi here too...
I've had good and bad experiences with DIR and non-DIR... and dare I say "semi-DIR?!"
Oh No!
My initial OW training was from a DIR shop with a non-DIR instructor. Good training but it could have been much better. GD was SUPPOSED to be my instructor, but it didn't work out that way.
At that shop I was immersed in DIR ego BS. Even as a non-diver before the class I could smell the BS. After my training I quickly alligned myself with people like GD and Rob Holman to begin really learning to dive.
My Experience:
I have been exposed to perhaps the biggest DIR jerks around and several of his "team." They continually told me that if I didn't do it their way, that I'd die and that "they'd never dive with me cause I'd kill them." I couldn't, and still can't, understand however how having a depth/spg gauge instead of just an spg was going to kill me. How can MORE information kill me? If I wear a bottom timer AND a computer... how will that kill me too? These along with MANY other issues (one I will share below) caused me to now drive 3-times the distance to my NEW favorite LDS, NWSD!!!
REGARDING DIR "SAFETY":
As a brand new diver who didn't know better at the time, Mr. self-proclaimed "DIR God" himself sold me a LOW PRESSURE steel 80cu' tank, with a valve rated to 3000psi, and a BURST DISK RATED TO 5000 telling me it was a HIGH PRESSURE 100 that I could safely "cave fill" to 3800psi!!! This means in a hyper-pressure failure, the tank will explode before the burst disk fails safely. He gave me some dog & pony BS about Canada's DOT and "we've been filling them like this for years," blah, blah, blah BS.
Fortunately the tank is safe, in hydro and visual, didn't have any damage and is now being filled appropriately by NWSD in Kenmore.
Oh the colorful things that came out of my mouth when I found that out.
For the record, I confronted him on this and he said he would order a REAL HP100 and trade me straight across... that was over 3 months ago and I have stopped hearing from him now... I don't expect a tank will be arriving anytime soon.
What does THIS say about DIR? How SAFE is DIR looking at it through this window? At the same time, I practice many (but not all) aspects of DIR in my everyday diving because, in my opinion, they HAVE made me a safer diver.
On the other end of the spectrum, I have several friends who are DIR whom I love. I have heard the DIR discussion a lot due to my gear configuration (which is NOT DIR) and have experienced people being fearful of talking with someone DIR because they don't want to hear 10 reasons their gear is all wrong and going to kill them. Even more so however is non-DIR folks just plain "not wanting to hear it" from the Nazis.
I don't know ANY agency (NAUI, GUE, PADI, IANTD, SSI, etc) that teaches unsafe diving. There are good instructors and poor ones... unfortunately, like real estate agents, consumers don't interview them or know what to ask if they do. The agencies themselves however do not endorse or teach unsafe diving.
GD said exactly what I was going to say. There are jerks in every sport, industry, church, whatever. In diving we're no different and within the DIR community there are jerks, and there are some of the nicest people you've ever met.
Becoming DIR doesn't make someone a jerk... they were a jerk long before they ever started diving.
I adore my DIR friends and there are other DIR folks I don't care for. I have taken what I wanted to from the DIR ideals and left the rest behind. I have a webbing harness on my backplate, but it has quick-releases. I have a bottom timer, and a computer. I have an spg clipped to my left side, but it also has a depth gauge on it. I use a frog kick, unless I'm using a flutter kick. I dive with DIR people, unless I'm diving with non-DIR people.
I wish it wasn't such an "Us & Them" mentality. But for some people it is and I do not wish to dive with them. There are far too many wonderful people in this arena to waste time with the sour grapes.
So there are my experiences with DIR folks. I think the DIR philosophy is a sound one, as is the traditional recreational philosophy. I think it's the PEOPLE that make all the fuss.
(Sounder quietly climbs off his soap box and humbly appreciates being given his time to rant)