I have one and use it when sanding and almost any time a lathe is on. If this one crapped out tonight, I'd have a new one tomorrow.
You only get one set of lungs (usually) and mine have had 40 years of smoke (fire fighter not cigarette), even longer of wood dust, second hand smoke etc etc etc.
Some people only wear something to protect from known allergens which is fine for them, but my lungs are worth the aggravation, weight, noise (which is slight but constant) etc others say are why they won't wear an air shield. Maybe after 40 years of wearing a fire helmet the design feels "natural" but it really doesn't bother me. I like the face protection as well. The one issue I had with mine their technical people talked me right through.