I am getting ready to purchase a MacBook Pro 13 and like the incase CL57486 http://www.goincase.com/products/detail/protective-sleeve-deluxe-cl57486 The only thing about this case that worries me is the white exterior. I know it's also available in black but I'm wondering if: 1) If anyone has had it for awhile does it pick up dirt really easily? 2) Find it offers enough protection against scratches? I will keep my macbook pro in another bag, so I want this case to protect the macbook's finish. Thanks!