Quick update - first 2 weeks the official tempered glass screen protector worked great... and then I started transporting my SP3 to school and back everyday in my backpack. A couple of times my SP3 turned on in my bag and when I took it out it was pretty hot. Unfortunately, one of these times, the screen protector slid off-centre, and cracked in like 5 places. Might be just a one-off, but this makes me think that it loosens its seal when the SP3 gets really hot. Also, I can't help but think that the odds of this happening would be less if it wasn't 0.5mm thick, and was instead a little bit thinner, so that the edges of it weren't raised and open to being slid around. Back to my folio case for now - don't think I'll be going back to another screen protector, at least not the MS one - will update on whether or not the MS store offers me some sort of replacement or money-back option. I've had nothing but good experiences with them so I'm not expecting there to be any issues on that front.