The trouble began when the aluminum-bodied 20" iMac replaced the white polycarbonate 20" iMac. Not only does it have a highly-reflective (albeit high-quality, very plane) glass, it has a TN screen that is 6-bit per channel. The TN screen found in the 20" iMac was inferior to the IPS panel found in the 24". Those who demand image quality had two choices: buy the 24" iMac or buy the 20", turn it toward the wall and make the wallpaper white so it lights up the user environment, and buy a quality IPS screen. This back-to-back solution may seem funny, but it does work. The TN screen displays different colors at different viewing angles (Unless the user moves his/her eyes directly over the pixel, the viewing angle variation relative to the pixel position causes the color to vary greatly.
The 21.5" is a major leap forward, because the entry-level iMac has the same GHz rating as the old top-of-the-line model, has a new two-AA bluetooth keyboard, and a wireless mouse. These are the added value that used to be extra before, and the Magic Mouse wasn't even available.
With the new 21.5", the users no longer have to choose a larger screen simply for better image/color quality. The glass, however, continues to be highly reflective and uncoated (no anti-reflective coating, as you may find on camera lenses, MacBook Air, and even Audi TT's speedometer/Tachometer).
Those who do not use the numeric keypad would definitely welcome the small-footprint wireless keyboard. It allows the user to bring the mouse closer to the keyboard and reduce wrist, forearm, and shoulder stress.
The Magic Mouse has finally done away with the problem-prone scroll ball found in the Mighty Mouse. I wish the top surface of this mouse were more matte/velvety than the glossy surface it is. The glossy surface is nothing more than cosmetic. Imagine if the trackpad on all the Mac portables turn glossy. I am sure there would be plenty of complaints. The glossy surface on the predecessor was OK because the fingers didn't have to glide over the glossy surface. Although the glossy surface is not a problem for me, because I don't use a mouse at all (Kensington Expert Mouse and WACOM, please), those with sweaty fingers would find it problematic.
Those familiar with the round iMac mouse will find this familiar: Its symmetrical shape lets the user easily lose orientation, because there is not a cord attached to it. As a result, the user must look at the logo first to identify which direction is supposed to be pointing up.
The integrated nVidia 9400M is more than good enough for casual users. Those who may need 3D or gaming capabilities should choose the other models with independent video cards.
NOW, THE $500 QUESTION. How does this screen compare to the 24" in physical dimension? This screen has 1920 pixels across, which is the same as the 24". The 21.5" is 18.7" wide, which is slightly narrower than the 20.25" width found on the 24". This means the 21.5" has higher pixel density. What about the height? 12.75" for the 24" iMac and 10.5" for the 21.5" iMac.
I forgot to mention that in the past, the power switch has a different shiny surface (while the entire back is matte) and has a concave surface. However, this one is perfectly flush to the back and is very difficult to detect. It takes some poking around. Another thing: they new wireless keyboard is noticeably noisier than the USB or previous three-AA aluminum wireless keyboard. Apparently the mechanism is not the same as the other aluminum keyboards.
Apple iMac MB950LL/A 21.5-Inch Desktop
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