I have used CPAP for 12 years (1 Philips, 2 Resmed Airsense 10). Each one was provided under different health insurance, United Healthcare, Blu Cross Blue Shield and Cigna. I prefer paying a single lump sum for my co-pay, but some insist on 10 monthly payments if the supplier can verify you are using the unit.

But wait, there's more. Each insurer had a different schedule for how often you should change the tubing, mask, hose and filters. I have boxes of spare parts because I would not replace per the insurer's schedule. I always replaced the air filters, always used distilled water and cleaned, but never placed a tank. The mask and hose are sturdy, so I clean and reuse until they leak too much.

ResMed AirSense user here. Do take note that the water reservoir in the recent versions is prone to leakage after around a year of use, and replacing it is pretty expensive.

I sealed mine with food-grade silicone as fellow users in the internet suggested, and it's been good since.

Agreed, the specialist I saw recommended Airsense (I have the 10) with the water tank (and I also got the heated tube, highly recommended) above most everything else for the machine, but the mask is actually a Philips respironics which are the most comfortable. They are all intercompatible.

Been using for about 5 months now and it's been great