Any CPAP users here?

I have used one for three years now and I can tell the difference when not using it. My biggest problem with my mask is to keep a good seal and keeping the air from leaking out. When the air leaks out it makes that dang hissing noise and my better half will elbow me in the middle of the night to re-adjust the mask. Attached is a picture of the mask I use-

I also use the gel mask and have few problems. The caveat is that you must get the proper size. I was using a smaller size, it had a good seal and it worked fine, but when I went to the next larger size, I would get leaks and irritations. I have been tempted to try the mask at www.nomask.com but have not done it yet.