I am in love with this fitness tracker! I wear it everyday to see my heart rate, sleep quality and even simply what time it is. The battery life is wonderful, and when I do have to charge it, it charges very quickly (1 hour-isn). It is very comfortable, and I love how you can customize its main face to display different information (weather, temperature, analog clock vs. digital.) The app is also really informative to what you are doing, and you can even set your stride length to get more accurate measurements of your step count. I also like how you can view your deep, light and REM sleep from the app, in addition to your overall stress levels.
I am so glad I bought this from Groupon, otherwise I wouldn't have been able to afford this little luxury piece.