This is great forum and I have learnt a lot in a short amount of time since getting my sleep studies done. My initial sleep study showed that I had an AHI of 94. They classified me as "very severe". After my 2nd study with the CPAP my dr has given me a script for a machine with a pressure setting of 6. I picked up a rental machine last week for a month of testing before purchasing. I have been given the Resmed Airsense 10 with a F&P Eson nasal mask. I have now used this for 3 nights, 8 hrs each night, and the AHI the machine reported is 24, 27, and 54 consecutively. I assume this is very poor, however am not sure how much reliance you can put on what the machine tells you on the display? Anyone have an idea on this? I am going back to tomorrow for further investigation with the supplier I have got the rental from. I assume they will suggest to increase the pressure, I am also finding the mask headgear too prominent and the straps that hook to the mask in front are dislodging when I turn from my back to my side. Any suggestions on a good alternate mask/headgear??