I've been reading but I haven't had anything to add to the discussion, but now I have a question.
I like my Wisp mask well enough, but since I am a side and stomach sleeper, I wondered if nasal pillows would have a lower profile and be easier to sleep with. I called my tech because I'm still in my 30-day window and asked to try the pillows. She showed me how they're supposed to go on, we figured out the headgear and off I went.
The first night I got a good seal, it seems, but I wasn't used to how it felt on, and had a very restless, CA-filled night.

Yikes. I kept waking, wondering if it was leaking, and not feeling confident.
Last night I tried and just couldn't stop the leaks. The pillows were hissing like crazy, and I finally thought "Enough!" and put the Wisp back on. I think I made the right call.

I'm going to try the pillows again; if I can get used to them, they may work better for my sleeping postures. But the Wisp is pretty good, I have to say.