The main problem that killed (is killing?) smartwatches is not only the limited use scenarios for them - is that battery times sucks. 24-48hs is already miserable for a phone, let alone a device you are supposed to attach to your wrist. My watch is a Citizen EcoDrive: rugged, accurate and never ever needs recharging.
I have several acquaintances who stopped using their iWatches or 360s just because it is annoying to put it to charge every night next to their phones. Been thinking about buying a 360 from one of them because there're some interesting apps for pilots out there but, in the end, its more a novelty than anything else.