CPAP's are the greatest creation ever! If you suspect you might have apnea please look into it. It will change your life.
I have a Fisher & Paykel SleepStyle 200 and I use a full face mask. I can't use the others because, just like during the daytime, I'm a mouth breather at night.
I can sleep without it for 12 hours and not feel as rested as three hours with it. It's really amazing.
My only problem is my fat head stretches the head band out quickly, which affects proper fitting/sealing.
I believe I could use a pressure increase but my rig isn't self adjustable.