Something has just struck me, after seeing recent 'How you use the watch' Video's that I'd not thought of, and not seen mentioned at all here before. Most of the watch you won't touch, tap the screen, and that's about it. However, this dial Apple call the Digital Crown. If you watch how it's used, and, it's going to be used a LOT..... It means pressing your finger onto the top of this wheel, and rubbing your finger towards and backwards to make the wheel turn, and also at the same time this will mean your finger tip (fingers are surprisingly abrasive, even without having dirty fingers with flecks of abrasive substances in the tiny unevenness of the skin surface. You are going to be, again and again, every single day running too and fro, too and fro, backwards and forward over the surface of the watch case where the crown wheel is. It will be interesting, given this one area of the whole watch, will get constantly rubbed, how this single area holds up over time, and if it becomes a well known spot for showing up dirt, and surface wear.