Sony's SmartWatch just got an update! The latest update cleans up the UI and adds new clocks to choose from!
I think this is long overdue. I use my SmartWatch quite often, and I prefer the look of an analog watch. The old clock stayed on, and drained the watch battery in less than a day. The battery-efficient digital watch would extend the battery life to 3-4 days, but I wasn't fond of the style.
The new clocks offer a good compromise, and my current setting is the Motion clock which turns the watch on when you flip it towards you, and shuts it off just a few seconds after.
Update it through Sony's SmartWatch app on your Android phone.