Rode this system about a year ago and returned since I was in NC for a regular 'rents visit anyway. Typical suburban NC trail system -- get a piece of land and cram as much trail into it as possible. Extremely well maintained trails with lots of rules, including everything being one-way but switching halfway through the week -- Sun-Wed one direction, Thu-Sat the other. Cumulative climbing was not massive for 13 miles but the lower loops by the river are chock full of abrupt, punchy short climbs (Miles 5.4 to 10) so it's a good workout. Trail in that lower section definitely much better in the Sun-Wed direction, having now ridden it in both directions. Also much more challenging compared to the loops closer to the parking lot, with sharp turns, off camber stuff, obstacles, huge dips and so on. Intent was to ride on consecutive days to stress the body a bit -- mission accomplished. There multiple quick stops to recover after some of the steeper bits on the lower trails. Saw no one else after leaving the parking lot but maybe because of the weekday and starting time.