Best fitness tracker Ive had. The battery life is EXCELLENT and it functions great never had an issue. Compared to my jawbone one this one is way better because it automatically tracks your sleep and activity unlike the jawbone and the jawbone only lasts like 10 days while this one lasts 30+ days.
Pros:
Very light weight & minimalist design. Perfect. I dont feel it on my wrist at all.
Amazing battery life after the latest update. It has been 21 days since my last charge and the battery still shows 60%.
Mi Fit app on Android is easy to use and gives good information on your fitness and sleep pattern.
Oh, it unlocks your phone too. No more pattern/password/fingerprint.
The band lights up and vibrates if there are calls.
Cons:
Initially the battery life was bad. Lasted no more than a week before I had to recharge. But after the last update, all is good.
Open Sesame(Smart Unlock) is not 100% accurate. Sometimes, I have to go back and configure it to get it to work and unlock my phone.
Data sometimes do not get collected? For example, it does not show me my last nights sleep data when I wore it. Could be a Glitch!