I really liked the concept of small, light weight appliance. HOWEVER...It was problematic to adjust. First, it was loose, and frequently slipping off. To adjust and snug up the nose-piece, caused great pain in both nostrils. I tried both the medium and large sizes. NO relief. I finally gave up and went back to my Solo. Much better, more comfortable, no pain. I regret this purchase, and strongly recommend anyone considering purchasing consider/ my review. I'd love to return this appliance and exchange for another Solo.