This is my 3rd purchase of the P30i.
For some reason I always come back to it after trying other masks, it's very comfortable and quiet. The headgear and frame lasts a long time and you just have to replace the nose pieces every so often.
Through much practice I've been able to keep my mouth closed during the night. The only problem that I have is likely due to my anatomy.
There is a less pliable silicone support just inside of where the pillows touch your nostrils. That can irritate my nostril depending on how I'm sleeping. The Dreamwear pillows are constructed slightly differently and I don't have the same problem with them.
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