Absolutely. Here's the most important part: I seem to have really bad apnea in REM, which is late in the sleep cycle and extremely important. Sometimes I would literally start awake and I was aware (a few times, not always) that I had stopped breathing.

The new machines, I have a Res Med Airsense 11 (had a 10 before that) is really good. I use a nose cushion and not a face mask. The latter did not work for me.