The iPhone advances in ticks and tocks, new designs alternating with more subtle advancements. I haven't decided whether the iPhone 5s is a tick or a tock. It most definitely looks like last year's model but there is also most definitely more to it than meets the eye. (And besides, which one is tick and which one is tock?)I've just gotten my hands on the iPhone 5s, and will be spending the weekend with it as I prepare my review. Now, based on a bit more time than I spent with one in a crowded room last week, here are some of my first impressions of Apple's new top-of-the-line iPhone.All that glittersI've been carrying an iPhone 5 in my pocket for the last year, and the iPhone 5s feels exactly the same. Same curved edges, same dimensions, same everything. All cases and ac
