I have so many masks now but this one is the best fit, the least air resistance (so easy to breathe compared to all others), once you get it into the right position you get a perfect seal around the face so all air is filtered, very comfortable so you can wear for longer periods. It's easy to change the P3 filters. The only slight negative is the look is a bit serious as if I'm on a mission so could be refined a little to look more like a regular mask.