My big question is: what do people do with theirs? Other than notifications and fitness tracking, I'm struggling to think of a use case for owning one.
Notifications and fitness tracking is more than enough. My phone hasn't had the ringer on in over 3 years now. At first I had a Pebble which is pretty much just notifications. Now I have a Gear S3 and now I'm using the fitness tracking all the time.
The cost is needing to charge the device daily, although at a 50% daily burn with AOD on this could be stretched to two days.