By midnight last night I had the rig assembled, tweaked, and ready to go.
This morning at 6:30, tires touched dirt, and it was indeed magic.
The Grip Shifts are wonderfully responsive and accurate. The disc brakes are a revolution. And the feel of this frame, so far, is pretty fantastic. It's still and light and eager, taking snaky singletrack in quick and precise movements and going upward as well as anything that's got me attached to it possibly could.
So far, so great.