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bigger screen, actually u think the question should be, "it won't fit in your pocket"
 
i have but one word....Fragmentation. Apparently Apple 2015 didn't learn from Apple 1985.
 
I still will not get an iWatch until it is able to function on its own untethered from the iPhone and has a battery life of 24-72 hours. I'm a nurse, have been for 20 years, and know there is no way the hospitals I work in will implement the watch in its current iteration although it is a nice glance at possibilities of the future.
 
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