I extremely recommend it to anyone who has sleep apnea. I even have the nasal mask model, not the nasal pillow one. I received mine at no cost at my CPAP clinic. I’m not sure how much it will value if you bought it. This is a singular kind http://troyzqcox.ampblogs.com/Great-Advice-On-Trouble-Free-CPAP-Mask-Advice-On-Fundamental-Factors-Systems-27072948