Actually, it isn't a matter of preference, it is a matter of usage. (First off, it is silly to purchase a Pro machine with an exceptional display and then have them **** it up for you, but...) The reason you would want a glossy screen is if the computer's primary use is going to be for watching and looking at things. If you want to use the machine to produce anything that you will want to match what you are seeing on screen, outputting either prints or videos, then you will not want to have Apple make this far more difficult by having them give you a high contrast, high saturation monitor. A glossy screen is a distorted screen, it makes photos, movies and the like sure look pretty, but if you want the world to see what you see, you better hope that they have a glossy screen too, because otherwise they won't. If you are not going to be outputting or sharing with people on their machines, it makes things pop by increasing contrast and saturation. I personally think that it is asinine that this is even an option on a Pro machine, but the pro machines are for everyone just the same. Although if you are a bad photographer, it will make your poor photographs look better!
