| I think they're a brilliant idea - I wouldn't worry about using one with pure O2 - as Woz says its all medium pressure stuff with little or no compression.
They put a simple oxygen and resuc set up within the realms of you average diver and most of what you need can be cobbled together from existing gear or an unused tank and/or first stage.
A non rebreather mask costs a fiver and will handle any conscious casualty and then a pocket mask with an O2 inlet which most people have already got will enable you to resuc an unconscious casualty with oxygen rich air. |