Guess I'm opposite to most of the replies here. I for one prefer the real estate of the big screen, and since neither is optimum for high end photoshop work, but both are quite adequate, real estate > all other reasons for me.
Unlike others I also feel the glossy screen is a major improvement over the matte screen, as do 3 or 4 of my friends who have changed to glossy after seeing mine. Yes you have to be careful because it can smudge but overall the increased saturation and sharpness is a plus and it is actually much more viewable in brighter conditions. While logically it seems like "reflections" would be an issue, in reality are not noticeable. A matte screen is reflecting as well, so anything hitting either screen is a problem. The diffuse reflection of a matte screen to me is more of a problem. Surprisingly, gloss makes reflections easier to deal with, not worse.
The LED backlight of the 15" is a nice improvement, but gamut size on laptops is limited more by the screen they use than the backlighting. As the article pointed out, the gamut is improved but still vastly inferior to even an iMac. Until a full 8-bit low power consumption screen becomes available, laptops won't ever approach other screens for serious work. Laptops (not just Apples) use a 6-bit screen (thus only about 250,000 native colors) and thus depend on pixel dithering to simulate most of the viewable colors. This is pretty much true of all laptops regardless of maker, and while they can display "millions" of colors, (meaning more than a few million different colors"), none of them can display the gamut of a full 8-bit screen. This is the major reason a laptop (any laptop) is not an ideal "final" editing machine.
I just bought the new 17" with High res glossy screen (second glossy screen). fantastic. (not as cool as my iPhone though )