I have really had good experience with the auto mode for casual stuff. When I'm done when the camera out of habit I seem to always put it back onto the green auto dial. Not really sure why, I guess I'm a little obsessive compulsive, and its nice incase somebody else in the house wants to use it and doesn't have to worry about it being in a manual or semi-manual mode.
I have yet to figure out the P mode, I seem to always get an over-exposed image (of people) even if I adjust the exposure compensation.
As for a status update, so far the lens has been excellent. I haven't got much use yet as it has been raining here a lot lately. Much heavier than I would have expected, but I really love the M/A focus mode and the lens is very well designed. Much more convenient than always switching lenses, so I'm glad I got it. Now if I could just get my eyes off of a micro 105mm VR...