I recently purchased the new Resmed Airfit F30 which is also a hybrid. I have used it for 4 nights with similar results as the F20. Leaks have been a bit higher which I will work on. I am a side sleeper and you get to know a mask and how to put it against a pillow to reduce leaks.
I do not understand why they just have a small and medium size but no large on. It should be small and large size with no medium. Also, on the F20 I use a large mask.
Compared to the medium F30 the mouth opening length on the F20 is about 1/4 inch larger (which I prefer).
So I think I finally have an alternative mask that works.
car54