Hubby just started using one about 2 months ago, they do take some getting used to. He had to adjust the heat and the moisture, the settings they set it on were way to cool and dry. After he got those 2 adjusted it has gone a little better. He still knocks the facemask? off at night sometimes.
I will say we can really tell the difference when he uses it and when he doesnt. He's not sleepy during the day and feels alot better.