Mine is so comfortable sometimes I forget I have it on. I would never think of going anywhere without it. I even use it when napping just so I do't snore. My unit is about 3 years old. I need to see how much it would be to replace it. I do know I need a new resorvoir. I wish my husband would consent to a sleep study. He sleeps so restlessly and never feels like he gets a good nights sleep. It is better since he retired and he doesn't lay awake fretting about work.