I haven't been able to use the new mask, because the flap smells of mildew, even after washing it. Since I'm rather allergic to mildew, I've decided not to spend the night breathing it. I've got a call in to the supplier to see about exchanging the mask when daisy_knotwise goes back to get her new CPAP unit tomorrow.
The most entertaining thing about the new unit is that I don't have to hit the switch to start it. I put on the mask and inhale through my nose. The sensors detect the pressure change and start blowing automatically.
I still have to switch it off -- although there's a setting that would make it shut itself off too if it detected that I'd removed the mask! But that's something I'll think about later. :)