It took me a few weeks to really get used to it. I would wake up without it on and wonder how that happened (it wasn’t just a little out of position – I had ripped it clear off my head). After awhile I didn’t want to sleep without it because I was sleeping SO much better. If you’re using the nose pillows, try the different sizes to get the best fit for you. If it’s too big, it will drive you crazy.
I’ve been using mine for over 2 years now, and it’s a little annoying once in awhile, but it’s worth it to be able to function during the day. I hope it helps – OSA can have serious health ramifications.