I like this mask overall.
One odd/slightly negative thing about it is that it truly smells like copper. This is assuring in the sense that you know the copper is there, but because of that it faintly smells of blood. Ive been wearing it for 2 weeks and it still smells.
Also, the lack of adjustability isnt great. I had to tie my ear loops carefully so that it would be tight enough without being uncomfortable on my ears. I do have a bit smaller of a face and buy adult small masks.