The SleepWeaver is the fourth mask I've tried since my June 2011 diagnosis. It seemed unimaginable to me that it could work but since it comes with a 30-day free trial guarantee, I decided to give it a try. I'm glad I did.
Everyone is different, of course, but this mask works very well for me. (My next favorite, at this writing, is the Swift FX nasal pillow mask.)
Here's the info link (and read the customer reviews) for the SleepWeaver:
http://www.cpap.com/productpage/circadiance-sleepweaver-advance-nas...
btw, I had trouble the first two nights so I called the company's customer service. The gentleman answering the phone was helpful. In addition, he sent me to a website for more help including a video demonstration, which was likewise helpful.
Here's the link: http://freecpapadvice.com/SleepWeaver_Advance_Circadiance.html
I'm a mouth breather so I also have to use a chin strap, which I put on first. I've tried the Ultimate Chin strap, which I liked but returned anyway (again, the 30-day guarantee) since I still wake during the night always like to take a sip of water, which was complicated with the Ultimate. I am now using the Ruby Pursome chin strap which works very well for me. It's my third chin strap.