I don't want one. I'm old enough to remember the trendy digital watches of the 1980s and how quickly the novelty of being able to tell the time in Tokyo and New York, or being able to do calculations, or being able to play a beepy tune wore off. Yes on a modern smart watch the multimedia experience will be much better, but I'm still doubtful about the usefulness and ergonomics. You could maybe do wrist based videoconferencing - as predicted in the 20th century - but just the relative angle of your wrist to your face probably won't make it a very flattering experience.

One possible useful function for a smartwatch would be as a wireless storage device. That would mean that you don't need to upload anything to "the cloud" and can be pretty sure of having your data with you at all times. That's not much better than storing data on a phone though.