Not much fun. Handy trail for anyone living on the north side, and short enough to ride after work. Can be extended to about 7 miles by going under 465. Smooth, wide singletrack. If you go under 465 and ride the extended loop it gets a bit more technical, but still pretty easy.
Beginners often have trouble with the steep climbs.
Recently became part of the city's park system, which should keep it protected from developers and has all but removed the motorized traffic. There's supposed to be a BMX course with jumps out in the field too. A lot of fun. Fairly technical but not too hard. There is also a trail on the north side of 96th Street.