Was SET on Matte, then switched due to Apple Engineer's advice
I was set on getting the matte display (wanted the best screen for post production on my photos shot with 5d Mk II)...The apple engineer informed me that not only was the contrast ratio better with the glass screen, but that the color accuracy was better as well (I was not aware of the latter). He said that it may be a pain when I'm in variable lighting environment, but as long as I could make sure there's not a window behind me (or something similar), the glossy would be much better. He also said that for Matte screens to reduce glare, they inherently cause refraction (or defraction, I can't remember) in order to defuse the light reflecting off the screen and that this reduces some of the color detail of the light passing through the screen to the user.
I thought about it and realized that about 85-90% of the time, I can control the light hitting my screen...so I figured I would put up with a little pain in the a$$ sometimes to have the best possible screen the other 90% of the time.
Hope that helps anyone who's having the same dilemma...