The Hummingbird trail packs a mixed bag of terrain. Loose rocks, large boulders, a 8-10' roller drop, tight switchbacks, high speed sections, and a few small jumps. The trail can be hiked with a DH bike from the trailhead at the Rocky Peak exit, but you'll need a shuttle from the bottom of the Hummingbird trail. It you want to ride your All Mountain bike, ride the Chumash/Hummingbird Loop.
The only negative is that it's gotten quite a bit of use (and abuse) from the DH'ers who have sadly cut new trails across sections that used to be nice technical switchbacks.