I like these tights as I feel like they give me some special support and compression when exercising.
Trail Running: They are great unless there is a chance of ever having a tiny bit of bushwhacking or overgrown trail. Then, as you can see in my photo - they will be torn to shreds.
Backcountry Skiing: Again I love the support. However for backcountry skiing I need to be able to pee without having to untie them every time. If I don't tie them tight, they fall down and you end up fighting the crotch every step. Although they give great support, they are not good for backcountry skiing because they MUST be tied.