The bangle.js:
- ships significantly faster
- has an always-on display with similar 4 week maximum battery life
- can be updated without flashing
- has a thriving app ecosystem
I have a bangle.js. It's... alright. Does the job. Feels cheap. OS is nightmarishly slow. Only one physical button, so annoying and fiddly to set with a touchscreen (interacts badly with the slow OS). Has GPS, but doesn't really work. Has heart monitor, but doesn't really work. Not terribly stable.