I'm so paranoid about getting my new rMBP 13" dirty! I got a keyboard cover just today, and it'll take some getting used to, but I love it. I'm VERY paranoid about getting the the area around the trackpad dirty/discolored/scratched, that I was thinking about getting a wrist/palm rest, but apparently, Apple said it could damage the screen. I don't get this, because isn't the rubberish lining of the screen the thing that makes contact with the lower half of the keyboard? Moshi said they've tested their palm guard, and everything's good (I'm wondering if Apple made this warning because of one or two generic guard brands?) Anyway, I want to keep my keyboard cover on at all times, and I want a guard, but will either damage the screen? What's your experience with them, especially long-term? Thank you!