Some of you know me as a user that is NOT a data junkie. I check data maybe every 3-6 months, maybe more, and typically say "OK, stuff looks good." And not much else.
I have always said that detailed data is important when having problems or making changes. I recently (and temporarily, I think) switched to a pillow mask because of some minor dermatological surgery that will take place on my face right under where my nasal pillow normally seals (between the eye and nose).
After first night, I did check data and I saw some unanticipated variations. This is the kind of time when having detailed data is crucial.
If interested, see http://www.apneaboard.com/forums/Thread-...illow-mask
I put this comment in separate because it is simply endorsing the need for data in these kinds of situations. The other thread talks about the "problem" and thoughts on ways to address it.