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The Atomic swivels are considered extremely reliable. I've never heard of one failing. They're not the cheapest but you get what you pay for. Atomic Universal Comfort Swivel discounts on sale Atomic
Ever tried surfacing using only the Air2? Add to that the complication of a conscious/panicked/unconscious buddy - with/without the ability to control their bc venting also. It may not always be your GF either - one of my buddies has been blindsided twice by OOA divers. Both ripped her primary out of her mouth with no thought for her safety (fear of drowning does that to a person). Since you mentioned "groups", it's a possibility. Also my friend is a DM with a lot of experience as a "rescue dummy" so she knows how to control the situation.
Some people would find that to be too much task loading - others (like my buddy) not. My regular buddy dives with an AIR2 also now, I don't consider it an issue for me. But we very infrequently dive in groups even though much of our diving is off a boat or liveaboard.
Ever tried surfacing using only the Air2? Add to that the complication of a conscious/panicked/unconscious buddy - with/without the ability to control their bc venting also. It may not always be your GF either - one of my buddies has been blindsided twice by OOA divers. Both ripped her primary out of her mouth with no thought for her safety (fear of drowning does that to a person). Since you mentioned "groups", it's a possibility. Also my friend is a DM with a lot of experience as a "rescue dummy" so she knows how to control the situation.
Some people would find that to be too much task loading - others (like my buddy) not. My regular buddy dives with an AIR2 also now, I don't consider it an issue for me. But we very infrequently dive in groups even though much of our diving is off a boat or liveaboard.