I have no doubt that the Apple watch will become an essential device in the near future, specially with the HealthKit and once they include 4G comms in it, to make it independent off iPhone. It has a great potential, like life saving situation: blood pressure, diabetes, collect live data to fight against Parkinson, Alzheimer, set up automatic GP appointments, and so many others. It wont be long, it's already doing a lot, with the help of many universities and research labs.