Male, late 60's, rode 73 of the 77 miles in 2 days. Beautiful in every mile, almost all of it canopied with trees, often great river views, trail smooth, very gently sloped and very well maintained (I encountered exactly 1 notable rock in the entire trip). Fully sufficient bathrooms and rest stops, and very good signage and mile markers. Able to average 11 mph without difficulty.
Marlinton is really the only trailside town - be sure to carry food/drink/repair items for other miles. Note the general absence of cell-phone service from Cass to below Marlinton. Marlinton likely can meet all basic food, shelter, and bike repair needs.
Good map (Read ALL of it!)
If you plan to be picked up by car, make certain to study exactly where and on which roads to meet; intercept points are not always obvious for drivers.
Surprised at absence of bathrooms at southern terminus.