Where Pebble fails?
1. Battery life isn't as good as stated. Battery replacement is impossible. It's effectively landfill technology. I stopped using mine once the battery life declined massively.
2. Poor UI. It has a 1980s digital watch type interface. So making apps to control your thermostat or music is pointless if it's more cumbersome than just getting off your backside and walking to the dial.
3. Display resolution is too low and is not e-paper, it is memory LCD.
4. Doesn't support Windows Phone, for a device which supports Android and iOS it should support Windows Phone too.