My hubby has used one for 28 years. He quickly became used to it once I did not have to poke him every 3-5 min to make him breathe again. I also sleep much better. I was dx with the not breathing deep enough and was given one to use. After losing 34 lbs, I find I no longer use mine, but am keeping in case I start to feel that Tired all the Time feeling. Good luck to you. The newer models are so quiet, and many different types of masks are available, Pegeth