Keep expecting Alex to jump in here but I think he is away taking pictures, shock horror !
When we were with Alex earlier in the year we talked about the design goals of the Auto magic and from memory it is not quite as strong a filter as the standard.
Again if my memory is holding up Alex said that you have a greater depth range with the original filter provided that you WB ( and even better shoot raw ). We were using the original down to 18/20m shooting the Ghiannis D stern.
So my take on the whole thing is if you can WB ( and ideally shoot raw ) then you are better off with the original Magic filter rather than the Auto Magic.
Bottom line is under the right conditions they will both produce excellent results, and convert to B&W ok also.
Paul C