I have mixed feelings when it comes to this watch. Overall it does a decent job of keeping track of your heart rate, blood oxygen level and the steps you have walked throughout the day and the watch looks rather nice. However I feel that the user interface is rather clunky and at times it appears to lag sometimes taking 10 seconds before it does what you ask it to. Also I find that it misses a few of the exercise options that I participate in. This is somewhat remedied by the fact that you can pair the watch to work with Google Fitness which does an excellent job of tracking your exercise and it has many of the options that I participate in.
I am happy with the battery life, not so much with the app and face options, etc.
I like the watch but the app running all the time is very annoying. This is the only app I've had that doesn't allow itself to be shutoff or only run while being used. Pairing was also difficult.
Nice watch. Somewhat difficult to customize and link to your devices and apps. Still having some issues, can't get calls yet (Sigh)....