So I've been on my new machine about a month. It's been a month of experimenting with different combos of masks and chinstraps etc.
I don't really know if I'm a mouth breather or not. But especially if you are not....... you should check out the cloth masks from Circadiance. I have the latest version of the Advance (for 3 whole days now). I've never felt a more comfortable mask. Ever
http://www.circadiance.com/