I finally got around to attaching the pen loop; aka, Microsoft's solution to keeping your pen with your SP3 via the keyboard. I'm astonished that this solution is an adhesive tab with less than 1 square inch of surface area attached to the back of the keyboard, which has what I would describe as a felt finish. Personally, I think the chances of mine coming off are slim because I've sandwiched the adhesive tab between the Stickerboy keyboard skin and the keyboard. Also, giving it a good going over with a hair dryer (which Stickerboy recommends for the keyboard surface anyway) gives me confidence that mine isn't likely to go anywhere. But if I just had it stuck to the back of the keyboard with nothing but the adhesive on the back of the little tab, I'd be kind of anxious about it just plain falling off at some point. Has anyone had trouble with theirs? Does it come loose? Do you have to turn it over and rub it good and hard sometimes (oops, phrasing!) to make sure it stays put? Or does it really just stay their, behaving like it's supposed to?