Well, this is my first contribution to this community...
I bought both the 9 inches and the 10 inches AAO, and I will make a brief comparison...
First, I would tell that I believe that in terms of looks, the 10'' wins by far...the 9'' is fairly sexy, but the 10'' is better loking, the metalic finish and detail is very atractive, and the mouse buttons change from the sides to to botton of the mousepad is a nice improvement...
I have to admit that with the 9'' I tend to use ctrl + a lot to increase the size of the text when I am navigating, and I not using this trick so often with the 10''. For a a 10 to 25 minutes work, I find the screen size to make no diference, but when I'am working for longer times, I really do...
My 9'' have the "jet-engine" fan sound that many AAO 9'' have, but so far my 10'' is very silent and less hot...
so far, I am borrowing my 9'' to my girlfriend and keeping the 10'' for me...I will report If I find something of interest in the future, but so far I love BOTH my AAO