Is this the JSP Powered Respirator you're talking about (Jetstream Dust Constructor Kit) ?I use a 3m mask, its okay but with bifocals it can be a bit of a hazard walking around a messy workshop.
For longer periods I wear a JSP powered respirator with a flip up face shield, I can wear this for hours at a time no problem. Belt mounted filter and power unit, the hose to the head unit is quickly twisted off so it can be removed. I often walk around with just the belt on and the head part can be easily put back on to carry on with dusty work.
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https://www.jspsafety.com/products/...am-dust-Constructor-Kit-(PSl)-with-Multi-Plug