matte vs glossy
Disclaimer: I'm basing the following on a comparison between the old MBP screens. Also, I have worked with color, imaging, and calibration issues for the past 20 years, so I tend to be pretty picky about displays in general.
Since I'm about to buy a MBP, I wanted to compare the two screen types so I went and looked at the old MBP's next to each other. My first impression was that the glossy screen had deeper color saturation and more detail.
Then I got into a conversation with the Mac person at the CompUsa store I was at, who actually was my age (55) and pretty knowledgeable. He swore that the displays would appear identical if they were calibrated the same. He was basing that on taking light measurments off the screen. I made an appointment with him to do exactly that on the bew machines, but here is the flaw in his argument, which he admitted.
All sensors that would measure the output from the display would be averaging that reading over the area of the sensor. This could give the same measurements for both glossy and matte screens because unlike photos, which rely on reflected light to produce the image, both the glossy and matte screens have the same backlit source that is theoretically putting the same amount of light through the pixels, through the surface and to the sensor. Because the sensor is directly on the surface, minor diffraction around the edges wouldn't affect the reading, and the sensor would capture all other light.
What is measured and what we see is not exactly the same. The surface of the matte screen is not planar, or it would be glossy. The texture of the screen will have a local diffraction effect that will change the light path according to the angle of the surface and the diffraction index of the screen surface, which I would expect would be fairly low, but not completely negligeble or again, there would be no matte effect. So this is going to have some blending effect which will appear to very slightly desharpen the image, even though a sensor reading that averages an area of pixels would be the same on both monitors.
I'm waiting to see the new monitors, (and really to see how the Mac guy intends to calibrate both monitors to each other. Probably trial and error until he gets the same readings, which again works on some levels and not on others). I'm leaning to the matte in general, mostly because if I want to do really critical work I'll use my G5 with a sony artisan monitor, and can't really imagine using a laptop for color critical work anyway. That's why I don't care about the 6 vs 8 bit actual vs promised discussions. I care much more about the evenness of the brightness and color across the screen and I expect the led MBPs to be better than the fluorescent.
If when calibrated the images are pretty close, I'll choose the slight image degradation over the reflection problem, but I might not if it were my only display. Also, the glossy would be much better outside, although that's not much of an issue for me.
Once I see the new machines and run the tests I'll post a followup.
Hope this wasn't to verbose.