Hi I originally panned the F20 after one night of trying it out, but since then have found that, if adjusted properly, it is less likely to leak than any other mask I have tried, and I have many unused masks. I use a Bipap AVAPS machine and recently travelled overseas for a few weeks, taking both my F10 and F20, thinking that I would use the F10 mostly, but after a few days of travel realised that the F20 gives a better seal, is more comfortable and the straps are more reliable and less likely to rub. I have tried many masks including nasal masks, pillows and full face masks. As I suffer from COPD, lung caner and sinus problems I can only use a full face mask and this is the best I have found so far.
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