I’ve usd the edge touring for Audax and touring for about a year and a half.
The bad
Battery life isn’t amazing, won’t last a 12hour/200km day, but it’s easy it keep that topped up with a external battery pack.
Biggest frustration is that you can’t turn off the auto-reroute, at least with this model, which is just annoying. Only real disaster was when I’d just got it and was riding the last part of a long day, and I didn’t realise that I was following the auto route, not the Audax route and wasted 50km. In November. In the dark. With four people following me.
The good
Got me from Oslo to Malmo this summer. Had some routes loaded into it (NSCR1/Kattegatleden), and occasional free map from tourist offices, but the Garmin also worked as a map on the go.
Don’t need to load maps onto it. All already on there in OSM form.
Pretty secure on the out front mount, less so on the bar mounted one for some reason. But only time it actually fell off, was when throwing bike up some stairs in a cross race.
Obviously, this is on roads no trails. But don’t see any reason why it won’t do for that as well.