PS. Have you noticed that in the picture of your BD ATC guide that you have it upside down? The rope going up to the anchor should be coming out the top of the device and the brake hand side of the rope should be coming out the bottom of the ATC (ie. the device needs to be rotated 180degrees clockwise). The braking action is supposed to be down in the opposite direction of the load (which is up). In this picture you would not be able to adequately brake downward (which would also have the rope rubbing along itself), so you would either have to break to the side at 90 degrees to the direction of the load or when you break the opposing load and braking forces would force the ATC in the correct orientation which would cause the belay loop to twist (thereby weakening it) and would also crossload the carabiner.

A direct comparison to Metolius TCU's would be nice...function, placement, especially shallow cracks and/or pin scars, size range, weight.