Don't let the flat sections fool you, this trail has plenty of tight, rooty and rocky sections that demand a good line and clear head. The hill just north of Watkins Mill Road is full of roots and rocks, making both uphill and downhill passage interesting. But with the nice open sections and a couple of long flowing downhills, you'll have plenty of time to catch you breath and recover.
The trail is well marked with blue blazes. There are some splits along the way, but there are plenty of blazes to lead you in the right direction. I may go back and run some of the other routes to see where they go, but we'll see how adventurous I'm feeling. However, the main trail is challenging enough and plenty long to provide an excellent workout.
There are a few at grade crossings, but most stream/creek crossings are done with a well constructed bridge. They have done an excellent job of clearing limbs and trees from this year's storms, so the path is wide open. At times the paths can be a few feet wide of well cut grass or as narrow as a bike tire. There is no easy way to characterize this trail. The easier portion is between 355 and Watkins Mill. Everything north of Watkins Mill is tougher, but certainly doable.
It is a fun trail and well worth a couple hours on any nice weekend day for the full course. Shorter lengths can easily be fit in after work, if necessary.