Richard, the data is a BIG deal. not having it is like flying blind and going on faith that you are getting the most out of your treatment, without any way to verify. 9 out of 10 times you can tweak things to be even more effective, so that you feel better. often the way things were set up for you are totally wrong. can you give us the exact model of your ResMed machine? if we have it we can probably give you some more specific advice.