I was surprised how well they perform, although as already detailed there are more advanced technologies in the works. From comments in another thread I thought we would want to raise the reference angle slightly, but ours appears to be set just right for maximizing low-beam range without causing excess blinding.
That said, the auto dim does keep the low beam in use slightly more than I would manually, but it's more than good enough even for a high-beam nut like me.
The low-beam cutoff is sharp, of course, thanks to the shutters. Consumer Reports gripes about sharp-cutoff low beams, but you can't beat 'em in fog. Maybe Ralph Nader refuses to drive in fog.