Kevin C. Tofel on the nut Apple has to crack with their Watch:

The Apple Watch offers most – but not all – of the features I have with my Sony and arguably, has a more elegant interface. Apple’s big advantage here is complete control of both the hardware and software experience; particularly with how well the watch integrates with a connected iPhone. At its core, however, it does most of the same things your phone already can do; just like an Android Wear watch or a Pebble. The watch brings a convenience factor though. Presumably, you can spend less time on your phone because certain glanceable information is available on your wrist.

There’s one commonality with all of these devices however and has to do with the challenge of bringing simplicity and value to the wrist without adding complexity. If an activity takes too long to do on a watch, for example, or requires too much engagement, you’re likely better off just pulling out your phone for a better, faster interaction.

I’m really interested to see how Apple Watch changes the dynamic between me and my iPhone.