Can you explain what is the advantage of Air2?? The group I dived with this weekend, half of them (the experienced half) have Air2 type of inflator/octo combo. I can see it has one hose less than the normal octo, but it seems to have other more pratical issues especially for bp/w users.
Most of wing have no shoulder dump on right side, the lower dump doesn't work on acsent. It seems with air2, the only way to dump is to take the air2 out of mouth, raise the the corrogated hose, dump air, put air2 back into mouth, clear, take a few breathes and repeat the whole thing again. It sounds hassale to me.
Even with wings with shoulder dump on right side, the donner will usually have his/her right hand holding onto buddy's BC harness, so cannot really use right shoulder dump easily.
Am I missign something here? What is the main advantage?
Sounds like you already figured it out!!

One less hose.