All I can say is all these palm guards, screen and keyboard protectors are a waste of money... The most important thing is how you take care and handle your Mac.
I have my mid-2010 15" MacBook Pro for more than 2 years, carrying it around for work and leisure. Surprisingly it still looks new. Why...? Because I'm a careful and detailed person. Once in a while I would just get a cloth and wipe the exterior and the screen. Pop out the back cover and vacuum the interior.
There's nothing can be done on the plasticky keyboard, over time it will just look washed out. Put it on you risk sticking it onto the screen. Type it on, you can't see the tactile keyboard. So why keyboard protector...? As for palm guard, you worry about leaving residue on the palm area, so you're back to square one. So why waste money...?
Don't even get me started with screen protectors. Wanna reduce reflection, go BTO and get the anti-glare option. rMBP has already got its screen glare reduced by over 70%
Granted the electronic circuitry inside my MBP is beat up, no thanks to my nasty hobby of crunching 24/7, physically it's still in pristine condition. I've only use an el-cheapo sleeve to put the MBP onto my bag for travel. No scratches or dents whatsoever, not even the bottom part.
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I've worked in extreme conditions like "junkyard" warehouses and motor workshops where dusts and greases are commonplace.
And I don't wear watches, so no worries about getting scratches on the palm area. To quote Tun Mamak, "Why wear expensive watches when one cannot be punctual." Malaysian time what...!