We've had the Ador for about a year, still on the original 6V battery.
We still have to check the coop every night because most nights at least 1-2 hens don't make it in, even with the delayed closing. The early birds sit in the doorframe or just inside and prevent later birds from getting inside, and they lose out, give up and roost elsewhere, so they don't even care about the last call feature.
Most concerning is we lost a hen a la 'guillotine' when she got her head stuck in the closing door and then hung herself in her panic - found her dead and hanging by her neck with the door about a half inch open. Per Rod, the door has a safety obstruction sensor (just sensing increased current in the motor), but once the edge of the door gets close enough to the frame, the magnets take over and prevent the door from reversing course. Her neck was not big enough to traverse this danger zone.