My thinking on this is simple - most of my thinking is simple
- it's the very fine dust that does the most harm to your lungs. Therefore, to me, having the most efficient respirator I can afford makes sense. If an APH10 filter takes out less of this harmful dust than an APF20 filter, then I'll buy - and WEAR - the more efficient APF20 filter. The argument that someone would have a Trend Airshield but not actually wear it due to it being slightly heavier than another model is incomprehensible to me. But to each his own.
Since I first replied to this thread, the Trend has gone from my wish-list to my inventory list - I bought it and it arrived yesterday.
Having worn it yesterday albeit just for an hour so far, it feels no heavier to me than the combination of full-face shield and the 3M half-face respirator I was using, but is amazingly comfortable from the breathing point-of-view. Fresh air over my face and no steaming up of my glasses. And the satisfaction of knowing it is the best I could afford in terms of filtration. There are powered respirators with even higher ratings but these are way more expensive and out of my league budget-wise.
And the cherry on the cake? I bought the Trend Airshield Pro from Trend Direct UK on-line for £189.60, about £40 CHEAPER than the Axminster APF10 Evolution which is shown on their site as costing £229.96.