Trail is great for jogging and biking. We rode from Mount Vernon up to Alexandria. For that stretch, I was a little surprised at how rough the trail was in sections (roots growing under the trail causing bumps, etc.) I was on a road bike and my friends were on their mountain bikes, and we couldn't decide which was better, which is surprising for a paved trail.
We were glad we were riding north from Mount Vernon, as there are some fairly serious hills (for casual riders) going the other direction as you get near Mount Vernon.
Other than that, it was very nice and details have been covered in other reviews.