Stratford, CT, USA
I have the ResMed Airsense and use the Respironics Dreamwear. Have used the Dreamwear mask for years. I replace the "nose piece" when it starts to leak, which coincidentally seems to be also about the time it begins to "yellow." The headgear proper gets replaced when the elastic is no longer useful. I have not tried the AirFit, but will be doing so as the VA is "ResMed Only."
I have discussed the SoClean with multiple physicians. Universal answer was that SoClean could not provide any data that the rather expensive device actually accomplished anything. I agree with those who advise cleaning weekly with vinegar, mild dish soap and complete cool water flush. Don't forget to clean the humidifier tank and any removable gaskets (ResMed).