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I've used my (previous) matte MacBook Pro and my wife's MacBook outside. The MacBook's glossy screen is way easier to read in direct sunlight.

Glossy screens are harder to calibrate, and while they look punchy, they can give people who need super-accurate colors for photo/pre-press work a tough time.

For general, non color-accurate work, including games, movies, word processing and such, the glossy screen gives things a very contrasty, saturated look that many people like. Its great for DVD movies.

I have machines with both kids of screens, and overall prefer the glossy. But then again I'm not a professional artist. My laptops are mainly for text work, Keynote, spreadsheets, email and web. The glossy coating I think gives everything a very smooth, punchy, printed look.
 
My perspective on this is to do with dust. The glossy screen on my MacBook is an insane dust magnet and it takes a lot of effort to get it off because the bezel is quite deep.

Matte screens don't get as dusty and don't show the dust like glossy ones do. For this reason alone I'd always get matte.

1. I have the new iMac 24" w/glossy screen.
2. No dust attraction to this 24" monitor.
3. Comments about doing graphic design on a matt vs glossy has been written to death.
4. I am a graphic designer and love the glossy screen. (People compare color on a matt LCD to the old CRTs, but have forgotten that CRTs had GLOSSY screens! Dah! And the CRDs were just fine for color.
5. My studio has 5 windows and even on a sunny day have no issues with glare!
 
I also just bought a MBP, and I rang the folks at Apple about additions. I use my laptop for photography, and I was advised by the tech that with the glossy screen I would never be able to achieve the color I see on the screen when I print. So if in your design work you are printing you will be compounding the problems that already exist between what you see on the screen and what you get from your printer. This tech guy had no axe to grind as both are the same price on the MBP.
 
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