The are two really worth riding, then one which is ok but gets better near the end. There's also what looks like a Xc/enduro track but I haven't ridden it so unsure about this.
Definatly worth a day out though, not many tracks you can do 8+ runs without an uplift.
Edit: nice vid by the way, I bet it was interesting in the snow happened to me at bringwood the other week. One second grip the next non! Sure was fun though