I’ve been running the Airshield Pro for a number of years. Overall, I’d say it was very good - albeit with a number of annoyances.
The protection (in terms of impact and dust) is excellent. It’s comfortable with glasses or facial hair, doesn’t steam up, and stops all manner of dust and debris. The last time I looked at the differences between the Trend and the APF10 I’m pretty certain the filtering class of the Trend was higher, but that may have changed.
The downsides are that it’s a bit cumbersome when moving around, and they’ve gone through several revisions of the headband. For me, the first (grey) version was the most comfortable, but had a tendency to snap. Trend’s customer support is excellent, but I’m probably on to my fourth headband (and I think the third design revision). The new one seems secure, but I’ve found it has a tendency to pinch hair.
Battery life is excellent; I’m still running the original battery and it’s going strong.
The optional ear defenders are OK rather than great. I find it difficult to get a good seal on the ears, but it’s definitely better than not having any.
If my unit were to give up the ghost I’d take a look at the (admittedly much more expensive) separate motor and helmet options from 3M, but would probably end up buying another Trend - despite the niggles.