I have been using the North 7700 for over a year and love it. The mask is very soft and comfortable; I have worn this mask for as long as 4 hours without any hot spots on my face/nose. The mask is very easy to put on and take off. I have found the breathing is very easy with this mask. You will need to be sure to clean this mask after use - the exhilation valve will get sticky if you don't use the mask cleaner to wipe out the moisture from your breath