It's a pretty easy level trail, with gradual climbs. Since it is basically an old highway, make sure you go in winter. We went in March, which had plenty of snow, which was surprising since it seems like we haven't gotten much snow this year. This trail has some beautiful mountain views in the distance and I had fun exploring "off-trail".
The only problem I had with this trail was that we could see (and somewhat hear) highway I-70 most of the time. I wandered into the trees a couple times to both explore, and escape society. If you want a trail a little farther from society and I-70, there were some trailheads that split off at the beginning, which headed away from the road. Although we didn't take them, the area was beautiful and I'm sure they are worth checking out!
Overall, it was a lot of fun. It was not very busy on the day we went, but we did see a couple people. Since it was pretty quiet, our snowshoe tracks made it the farthest along the trail. To celebrate our feat, we made snow angels in the untouched snow.