Yah, it does work well. I do a lot with my watch.

* Morning alarm clock (buzzes me instead of noise - key when I sleep with my kids) * Heartrate tracking (all day long across multiple things - biking, walking, resting, etc) * Sleep tracking * Notifications (small part, but useful) * Calorie burn * Sunrise/sunset * Temp outdoors * And of course, date/time

I have a complication setup that delivers 6 stats quickly. Biggest feature for me. For quantifying my data, the watch has been really good for me. I'll prob go series 2 so I can go all in for water activities.

Looking forward in the future to measuring even more.