I tried a few masks, not really that many, before I settled on the P10.
There's been a lot of static about the P10 straps, and perhaps Resmed deserves it. But I think they are really being over thought. After using the P10 for awhile I felt I had stretched the straps a bit too much. So I just took a pair of scissors, cut them in half, overlapped them about an inch and pinned them together with safety pins. Now they're fine. Much easier than relegating another mask to the shelf that had for me been a great mask experience. So whether the P10 or any other mask you like, don't give up on them without a fair workout.