I've been thinking about why MBPs SD card slot make the SD card visible. From a design perspective it's really ugly and doesn't at all go with Apple's sense of design. From a practical view it really isn't that good either since exposing the card may cause damage to it. My guess is that Apple wants the SD card slot to be used for temporary things, such as transferring photos from a camera and not an permanent extra storage. A 32 GB SD memory costs about 70-90$ which to me is quite cheap to extend your internal storage space. I think it's petty of Apple to do this, but as with a lot of their products they just want to make more money. Hopefully they will come to their senses and make a card slot that doesnt reveal the card, it's annoying.