I always need to remember to breathe through my nose, because I've always been a mouth breather.

I use one also when i go out. It takes getting used to. I’m been on it for over 2yrs and still have trouble sometimes. It’s Heavy make noise,,,,!!!!!! But need it for getting out of the house.

Me too!!! It is not easy.

Coming here to ask similar question. I just got an Inogen. It is a “pulse” delivery. Really takes some getting uses too.