flots am
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There have been quite a few folks in this thread on both sides of the fence. Are any of them wrong? NOPE!!!
I'm on both sides of the fence at the same time.
On "me" dives, I dive with an actual alternate second stage that's every bit as good as my primary.
In class I teach with the Air-2, just because the compromises work out better for divers that will probably (hopefully) never have to share air again.
If you're going to keep your skills sharp, a real, alternate second stage is miles ahead of an Air-2, however if you're just going to ignore it, an Air-2 is much easier to find and much more certain to be functional in an emergency, even if it's not fun to breathe from.
flots.