I have only used this mask one time, so I can't comment on its longevity, but its effectiveness is WONDERFUL. I SMELLED ABSOLUTELY NOTHING while painting my log home with a thick, oily paint that was thinned out with thinner!!!!!! It's light, does not open up at the bottom when I tip my head to my knees (like my hard gas mask did) and attached very easily without needing adjustment (of course, the size matters here for the Velcro to seat correctly). I love this product and am so grateful that I can work on my dream home without looking like the frog man.