Yes, I have a CPAP machine. The machine is so quiet that my DH doesn't even know when it is on. I was so excited after the first night of sleeping with the equipment at the sleep lab in 2009 that I knew this was a positive life changer. My set up with the nasal pillows, regulation length hose, plus humidified air allows me to sleep without any discomfort.
Someone with the mask covering both the nose and mouth would have more of an adjustment to make just getting used to the mask apparatus.
Some labs offer the desensitivation kit to allow the patient to practice using the mask at home. The idea is to make the patient comfortable with the set up and increase the possibility of the patient using the machine. DH has done this route and I have no doubt that he will continue to use his CPAP each night.