RE: Swift FX Nano
I just started with a Swift FX nano. I tried about 5 different masks when I started (1999) and settled on the Ultra Mirage, then it changed to the Ultra Mirage 2. Of the regular nasal masks (I tried the phantom, respironics gold, repironics regular, another mask I can't remember and then the Ultra Mirage) the Ultra Mirage was the lightest and most comfortable. I was as high as 18cm for a while and the UMII stayed on pretty well. I've lost weight and the pressures have come down. The UMII still was nice, but my RT suggested I try the Nano. It took 2 days to get comfortable with it, but I have been using it a week and a half and it is very comfortable, gets dislodged or leaks less then the UM2, and allows me to do my sleep inducing crossword without interference.
I really like the Nano and will be reporting to my RT that I am keeping it and discontinuing the UM2.
Make sure you aren't too tight. I have been surprised at how loose I ended up with the UM2 and now the Nano also likes a very light fit...I have some smile creases that are hard to seal (Why the Phantom and Resp. Gold didn't seal well with their gel masks) and the Nano seems to O.K. with it...