Four friends used C-PAP machines anywhere from one month to a year or so. Three hate it so much they gave up on them! (The only woman in the group has used one for many years and she likes it.) My cardiologists recommended I use a C-PAP but I refused after hearing my friends' complaints. That was two years ago. I experimented with 3 or 4 mouth tapes and settled on the best brand for me. I will use them til the day I die!