I have to admit that we haven't used these in anger yet, just tried them on for a few minutes. We will use them on the aeroplane on trips abroad. They definitely feel light, but rebust and seem to seal very well and comfortably. You can hear the valves clicking in one of the masks as you breath in and out, which is both reassuring (I think) but might prove a little irritating on a long flight.
Should we ever get on a 'plane again they would certainly provide confidence, assuming that that audibl...