Over time, opinions about existing products and diving practices change. Safer, better ways of doing things and technology are natural progressions of learning. Searching through old posts has been very much a learning experience, but I would not hesitate to ask a same question again, even if it had already been discussed ad nauseum, just in case someone came up with a better way or product since the last time a certain topic was discussed.
I would like to think that we divers who use life support equipment in our endeavours are constantly upgrading our way of doing things and kit. In doing so, we may arrive at something that resembles a common standard. It might even look like DIR...
:wow:
~Marlinspike