My second hike in Evos was on a trail near/on Moose Mountain in Southern Alberta. It was mostly gravel but some meadow, moss, bog, mud, dirt, and grass. We hiked mostly uphill for just over an hour and then back down. I had no concerns or issues with walking on all that gravel. The Evos handle it very well. And again, no problems with grip either.
I remember my calves were quite sore for the next two days. I'm just getting back into hiking and with all that uphill, it wasn't too surprising that I was feeling it the next day.
The Evos are an incredibly comfortable hiking shoe and I highly recommend them for anyone for almost any terrain.
Here are some pictures (there's only two because we spent more time hiking than taking pictures):