Just got these last week. Taken them to Alta, UT around 5 times since I've gotten them. Only groomers at the moment so can't say much about the breathability of the eVent material since not doing any work on the groomers. The eVent doesn't quite stop the wind like the Gore-Tex Pro Shell material, but definitely helped with the wind. Was really cold yesterday, -2 degrees fareinheit without wind chill at the top of Collins chair yesterday, and it was windy. The eVent did a good job stopping the wind, but like I mentioned, my Gore-Tex Pro Shell jacket did a better job.
I am 6'2'' and usually get all my pants in the size M. Which I did with this pant, it fits great, except around the crotch, it's a little tight. Could use an extra inch like the large has, just don't want to move up the waist sizing at all since this fits perfectly if not a little loose. So the crotch is kinda tight sitting at 6'2'', but other than that the fit is amazing. If the inseam was an inch longer I'd give it 5 stars for the price I was able to get them for.
Hoping these work out great for touring and hiking. Also the crampon protection on the insides of the bottom of the pant seem to be in prime locations; can take these ice climbing!