Hi. Just ordered my new 17" MacBook Pro from MacMall. So excited!!! 

Anyway, I read that Mac keyboards get greasy very easily- after just two months of ordinary use I heard that you get grease stains and pretty soon they become permanent. I do see a lot of grease on the keyboards of the MacBook Pros at my school so I think this information is true (considering the ones at my school are just 1 year old). Would somebody confirm this? Either way, just to protect the resale value of my computer, I would like a keyboard cover. I was wondering- do they make typing harder? Also, which one should I get? I have my mind set particularly on the iSkin ProTouch FX because of the colors but I've been reading some bad reviews about them- that they make typing a lot harder. Then I was also thinking about the Moshi ClearGuard and people were saying it was better but I really like the colors on the Protouch, which one should I get? If anyone has either of these and could give me a review.... thanks