I've had problems with my macbook staining where my wrists rest and where my finger clicks the trackpad, and i know a lot of others have had this problem, too. I looked up some posts on this and apple replaces the plastic with new plastic that won't stain. They sent me the box today to ship it in, but before i ship it, i want to see what the new plastic is like - is it a lot different than the original or different at all? Have any of you all replaced the plastic yet due to staining issues? Thanks!