I'm not a die-hard DIR fan, just a humble diver.... but my experience with Air2 was not favourable.
Dave.
ok I'll bite. I bought the Aqualung Air3QC about a year ago. Not sure of the differences, but I don't have the issues that have made you uncomfortable. That said, I traded out my old inflator pretty much after the first few dives and like the Air3 more and more every dive. Truth in advertising, I always dive a 19cu pony as well, so I have a backup to my backup, though thats not my primary reason for having a pony, just works out that way. But my "Dammit! Reg knocked out of my mouth" go to is my Air3. And it works great.