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I have a couple of 3m ones and have some decent paper ones which I feel are better than nothing. The other day I thought 'I should buy myself that fancy respirator' :-
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When younger used to just 'man up and breath it in'. Then slightly older decided to buy a decent mask, worth £30 or whatever it cost, paid for itself on day 1 for the massive reduction in black gunge in the nose for days after, throat and general side affects of breathing in massive quantities of filth.
Still got the same mask but keep several filters on hand depending on the job, you can blow them out with a compressor a few times. Also found sticking the whole thing in a bag in the freezer helps keep on top of stuff growing in it.
Do you mean with supplied air or a mask with filters?