This might not be a problem if the watch had an adequate vibration mechanism.

Some say it’s too weak a vibration, but I have no problem telling when something comes in

: Vibration is impossibly weak and unless you install an app like "Feel The Wear" to set additional buzzes (which are heard more than felt

I can confirm that the vibration is weak, at times I don't even feel it

I don't need watch that talks, but a beeper alarm would have been nice.- Stronger Vibration

Unfortunately, though, the vibration was weak enough that I ended up missing more than half of the alerts

The battery life for workouts (5-8 hours depending on whether you're using Bluetooth audio and HRM) is fine for casual to moderate runners, and unlike some of the reviewers here, I did not find the vibration to be a problem (it's on par with other Android Wear watches and didn't seem any worse than Garmin)

However, the heart rate monitor as spotty at best, and the sleep monitor function is next to worthless as it reads sitting and reading or watching TV as sleeping and provides.