I've had my ResMed Quatro Air for about 4 yrs, so maybe there are newer/better full masks available. I had an scary event with chemo induced acid reflux, and have not reused it. I have heard that manufacturer makes an air tube that has a heater wire in it to prevent invisible mold/mildew from forming inside. A preheating feature would also be on my next unit, since I hate the cold room air , blowing in my face. I took early retirement, so I can sleep as long as I want now