"3M is a brand that I have always entrusted with the health of my lungs. Having used their respirators for years, when my last one needed replacing I bought this.
However, I'd have to say that I'm somewhat disappointed. Whilst the performance, so far, has been very good / excellent, the adjustment for the straps is not up to par.
It uses silly little friction grips that it is easy to end up pulling more of the strap through than wanted. This makes adjusting the mask for the optimal fit somewhat more awkward than it needs to be. I found that just as I thought I had the right fit, I'd go to put it on and then the strap would slip through, again!
That said, when using it whilst cutting MDF it work very well, with me completely unaware of any dust at all."