For years I have had trouble with the facemasks I've had... they either don't fit right or make me feel like I'm in an air chamber and I felt claustrophobic. But the worst trouble I've had with all of them has been air leaking out from one part of the mask or the other, which would wake me up and make a lot of noise. Not with the AirFit F30i, at all... Fits great, Very comfortable breathing and comfortable to wear, and No air leaks!! It's the perfect face mask, and I sleep like a baby the entire night.