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It has 3 main utilities for me:
  1. Sleep tracking. Length & quality of sleep are important for health and longevity. Having a low heart-rate while sleeping is hugely important for long-term health. Having the watch measuring my heart rate has gamified it for me. Bad choices during the day means higher heart-rate at night.
  2. I HATE my phone making noises at all. I keep it silenced 100% of the time. My watch vibrates whenever a text/call comes in. So, I don't miss notifications, but I don't have to bother everyone around me with annoying sounds.
  3. Exercise tracking. Being able to monitor my heart rate during heavy cardio is important. This adds a gamification element to physical fitness. I try to beat my previous numbers, and improve my biometrics over time.
These 3 things make the smart watch worth it. Otherwise, I would not own one.