This place is a total blast. Wooded, quiet, not too crowded with people (we only saw about 6 others on the trail--it is winter) and the lake make it scenic and calming, but the trails rip! They are VERY fast, twisty, pretty fairly smooth. We had one water crossing that froze our feet, but the whole trail system is dry and clean for the most part, both of leaves and wet mud. I think they designed it great, with good drainage and challenging trails. Don't let the sign that says "experts" go one way and "mortals" go the other scare you. That section (back side of the Red) is not really as hard as it looks, with the whoop-de-dos.
We rode for about 2 hours, did a section or two twice, for a total of 18 miles. Pretty cool riding---relatively tame, no long hard climbing. Good if you want a quick in and out, with no possiblity of getting lost.