Soggy:
You won't know the AIR 2 is a problem until it is...and at that point it will be too late.
I still don't understand how fewer hoses is better than reducing robustness.
Look at it this way...technical diving is all about minimizing failures and providing redundancy. If extra hoses were a concern, why wouldn't technical divers be all worried about extra hoses and be using air 2s? A very little bit of care will leave your hoses lasting years and a little bit of inspection every so often will prevent ruptures.
I can accept that they aren't necessarily a death trap, however they are *clearly* not an optimal solution and I cannot fathom why anyone would ever jump into the water with less than optimal gear, especially when the alternatives are less expensive, easier to maintain, and more reliable.
I don't see how another reg is more robust than an AIR II, I've practiced many times drills simulating an OOA, I can vent and breathe at the same time, no deco ever, been using one close to 10yrs over 400 dives and never let me down, I service it myself and it's allways well lubbed and ready to rock.
I'm not talking about hoses being blown, that can happen to anyone at anytime, but mostly, it can be avoided if you check your gear every time you use it. I'm talking easy of packing, service, rig your gear, streamlining, less entanglement posibility, ect. these are all advantages in my opinion.
IMO, for rec diving, it beats the crap out of carrying 2 2nd stages anyday.
You should know how to use your gear in an emergency and practice with it regularly, being it an AIR II type or a bungied necklace, the user have to practice and be proficient with the gear that he'll be using.
Maintaining and AIR II is no diferent than any other 2nd stage, if you can do one, you can do the other.
The more reliable issue that you mentioned, is not true, since I've never had any issues in the time I've been using it.
IMO it is optimal gear, serves 2 purposes well and how it was intended to.
I'll grant the higher price tag, but diving is a gear intensive sport and a diver has to spend money to get what he wants, I got a closet full of gear that I don't use any more, but it served the purpose when it was bought, very few things I've bought dissapointed me since I tend to do a long research before buying, most dissapointments were rushed buys.
When a diver jumps into tech diving, then money for gear and carrying gear around is not an issue at all, but if you are a rec diver that dives in the no deco limits, you don't want to carry, maintain, clean, rig, buy, ect more gear than you have to, so tech and rec are 2 diferent animals, you can adapt some tech techniques to rec diving, but lets be fair, not everyone is DIR so no 2 gear sets are identical out in the real world.
You won't find a techie on a cattle boat, and you won't find a rec diver in the Andrea Doria.
I'm on the middle of the worlds, do 1 or 2 cattleboats per yr, and dive with my buddy every other sunday on a fishing charter boat just for the 2 of us and maybe 1 or 2 guests that we know.