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A while back I did a lot of business travel and in that situation a watch with world time actually has real value. Same story with ergonomics- rushing through a crowded airport with luggage in one hand and documents in another, it is much more convenient to have a device strapped to your wrist rather than having to reach into your pocket. I think a 'hands-free' smart device will prove to be useful in many other unexpected ways, regardless of the screen size.