The problem outside of solo diving and carring a pony, boils down to this: If you think you are self sufficient and your buddy is equally geared then your buddy skills will suffer. A year or so ago we had a couple of DM's diving out here. Both had pony bottles - they were buddied, but both were self sufficient. One made it back to the surface the other didn't. The one who died, had drained his back gas, and not touched his pony.gcbryan:The arguments against using a pony lose me. If your buddy is your backup air, great. But wouldn't it be better to be self sufficient in the first place? Use your own pony if a low pressure hose breaks and then go to your buddy for assistence.
You don't have to stop being a good buddy just because both of your use ponies.
One of the most important things that the DIR approach brings to the table is buddy/team awareness. I dive with non DIR divers all the time, but the one rule that I never break is that we go down as a team and we come up as a team. My sac is pretty low - .35 typically which means that I can stay down longer than most people. A dive earlier this week found me diving with a guy that had an AL 80 who was getting low on air after about 35 minutes. I put him on my long hose and we continued the dive in the shallows for for a total of 62 minutes. If he hadn't gone on my long hose I would have finished the dive much earlier without any reservations or concerns. I would not have left him to get to surface on his own or for that matter to even swim back to shore. The way I dive is to be no more than 10' away from my buddy at any time, most times we are shoulder to shoulder. This technique only came from my DIR training. If something goes wrong with my buddy, I may the first to know it.
If I have an ooa situation that last thing I want to do is to be to far away from my buddy. If I were to hand off a pony to a new diver my fear is that they will bolt. At least with the long hose I can monitor the situation. It allows me to gain or keep control over a situation gone bad.gcbryan:If a long hose is great because you don't have to be so closely tied to each other why not use a pony and not be tied to each other at all?
Why start on a path with singles that you will have to change when you go to doubles?gcbryan:I understand the references to cave diving. If I were cave diving I wouldn't use a pony either. I would be using doubles.
All of this said - I understand the NJ requirements, I also understand carrying a pony if you are solo diving - I have. I guess I understand having a pony for a buddy of circumstance, but again I dive with a lot of different divers whose skills range from new, to rec, to Tech3 and I don't carry a pony. I have yet to have issues with a BOC because I spend a great deal of time before the dive going over things. My buddy awareness doesn't really change between a new diver and tech 3 diver. Unfortunately if you believe that you are self sufficient, you will treat your buddy that way and your and their buddy awareness will suffer.