A antiglare protector shield in no way compares to a true matte screen on the MBP. First the product may reduce glare but it's plastic, and plastic itself produces a hard glare when light shines on it. Another thing, as others have mentioned those screen protectors end up with "rainbow" effects which renders them useless. Another thing, after spending good money on my Mac, the last thing I want to deal with is trying to lay a screen protector that produces bubbles and dirt gets underneath and it just gets frustrating. Why fake it when you can have the real thing? Lastly, a screen protector will not offer all the benefits of a matte screen. For one thing, the MBP matte screen produces natural color, especially for printing, you won't get that benefit with a screen protector.
OP, you haven't seen a MBP with matte screen close up. The trim around the screen bezel and the hinge are black so there's just the right amount of black trim to match the keyboard color so it doesn't look out of place. Honestly, if you want to talk about ruining looks of your MBP, those screen protectors nullify the "Macbook Pro" moniker on the bottom of the screen bezel on the glossy MBP so it makes it look ugly.
One last thing, Moshi doesn't make all products good, their keyboard protectors are the worst in the industry. They get cloudy from finger oil wear and it's virtually impossible to get the skin oil off and then you end up buying another keyboard protector because you can no longer see the keyboard underneath. iSkin is the best keyboard protector.
