Never had the VDC activate before. On my way to work this AM I saw a patch of ice ahead just before the apex of a left curve. Got off the gas and when I was close I just pushed in the clutch. Thought I had both axles over the ice when I let the clutch out. Rear end went right, VDC kicked in and that tail came right back in place before I could correct w/ the steering wheel. It appears that the VDC really works, at least in this situation.