Battery life is amazing. Almost a hole week without needing to recharge and it takes like half an hour to fully charge.
Really waterproof. I’ve used it on pools, in the shower with very cold and very hot water and nothing happens.
The app is very easy to use and very practical; it allows you to see WhatsApp messages on the wrist, SMS messages, Facebook Notifications, etc.
BEWARE: signing into the app is a bit tricky and annoying. You will receive a “this account doesn’t exist” message several times. Just create the account on a computer, not from the mobile App.