I've been using the AirFit P10 Replacements for a number of years, and have it set up on a regular subscription plan. The replacement assembly and pillows absolutely do reduce the airflow noise which increases as they age. My only complaint is that I only need the large pillows, but the replacement pack has all three sizes, S/M/L. It would be MUCH better if I could specify the pillow size and just receive the three pillows I actually need. The unused small and medium pillows add to the cost of the package, and end up being wasted.