About a month ago my sleep study showed severe apnea, AHI 82 with mean duration 25 sec. Immediately I started therapy with Resmed S9 Autoset and Mirage FX nasal mask and so far everything is fine and I wake up in the morning feeling great. I don't find necessary to use Ramp function and I start immediately with the min pressure of 8cm. I had nasal congestion for a couple of nights as I caught cold and I ordered Quattro Air to have as a backup mask. I used it the last 2 nights and it works fine too with almost zero leaks but AHI is significantly higher. With Mirage FX leaks were higher but AHI almost zero, I don't know if this is common when changing between masks.
Here is a printscreen from ResScan and I think that I am doing quite well for newcomer.
(As a newcomer I cannot insert image or URL so copy/paste URL to your browser)
Anyway thanks for the information I have found here and I apologize for my English as it is not my native language.