DIR does extend to recreational diving. they have a begining fundamentals class where they hammer away on the basics. All of the dives are in less than 25' of openwater and they work on making you a more competent buddy.
If you look at the new NAUI tech diver trianing materials you'll find them to be very DIR oriented.
I do not use all Halcyon gear because there are so amny other companies that make good products for a lot less. Personally, I really like Diverite, but I see that even OMS is coming out with a DIR line of gear- so it must be catching on.
I have dove with GUE trianed divers on wrecks with less than 3' of vis and over 180' of depth. I had never even met these people before the dive, but we were in total synch under the water. That might be the best part of the system. everything works together no matter who you with- if they do it right.
With others we have switched out deco regs, bottles, second stages, lights, ect. with each other to make a dive. Everything is interchangable and they are not all the same manufaturer. They are just set up and adjusted the same.
I have dove with non-Dir divers who were competent and safe, but I have to admit that it was pretty much a hit-or-miss proposition when I first met them. I must also admit that the vast majority of non-dir tech divers I have met are a mess in the water. That doesn't mean there aren't good ones out there, just not around these parts. When it comes to GUE trained divers I would have no problems jumping in the water with them the first time we meet.
I used to have a Transpac, but got rid of it and switched to a backplate (Diveirte) and wings (Halcyon) for all of my single tank diving. I think that it fits better , doesn't have any chest strap, that interfered with my drysuit inflator and, most importantly, packs smaller for tropical travel. The only piece of gear the Halcyon really has over the other companies is their single tank wings. Anything else can be gotten for a lot less money from other vendors.
The only bad thing to say about DIR is that some of their main spokesmen can be a bit over the top.
Jon