Based on the answers here, I don't think everyone is on the same page, or I'm just confused (a common occurrence!
). It seems some are talking about how easy it is to remove the AF ring, and whether they do. Others are talking about how easy/hard it is to unscrew to fill.
I think the issue with this tank is: With most tanks, it's pretty clear cut - grab top of the tank while holding the base to leave the deck on the mod, or grab lower on the deck and unscrew the whole thing. This one just doesn't give as much room to grip them independently. I've been playing with it, and with mine, grabbing the tank only unscrews it from the base most of the time. And If I apply enough pressure to the ring while grabbing it at the base, I guess it's easy enough to unscrew the whole atty. But it would have made it easier to do (without even looking at it), and more foolproof if they'd made a stop point on the ring. And if you really tighten the tank to the deck, I guess it could make it harder to remove the tank only.
Anyway, I still like it either way! I was thinking of trying the SJMY, not just for the potentially tighter ring, but to try the larger airflow hole.