Yes I use one all the time, its the old Racal "Airlite" its great, its getting a little old now & the headband broke last week so its being held together with tape at the moment as spares a thin on the ground
I have some eye complaints & even walking down to the shops with all the car fumes we have here the next day my eyelids are swollen up, whenever I wear the Racal mask for woodworking it keeps all the dust outside where it should be, I wear glasses & after 6 hours of creating all kinds of dusts I come indoors & have a look at my glasses & not a spec of dust on them, so its well worth the investment in one.
Like I said, I mainly have it due to sensitive eyes but its really good & stops you breathing in all those harmful dusts.
The only thing I wish is that I would have gone for the model where it has an offboard motor, it can be a little heavy on my head & you constantly hear a bee in your helmet which of course is the motor..
They are really good though,
Nick :wink: