I have been using Mi Band 3 from the day 1 it was launched and it has remained since than true to its features
The look and feel is very good and nice the small band with a good quality rubber strap that does not gets off easily while doing daily routine work.
I have been wearing it to the gym and its totally sweat proof and accurate in its calorie burn figures
It has simple navigation which any one can operate and has a brightscreen so that every thing is visible aptly. Though not that good in bright day sunlight.
It has steps counter, calorie counter, weather reports, notifications. date day and time.
You can decline a call but can’t accept it. You have alarm notification and snooze it as well. Feature rich band I would say.
It has a battery life of 20 days and yes it almost covers the same duration for me. Sometimes 18-19 depending upon my usage.
It will drain off earlier if you switch on all its notifications for vibrating on every call and messages.
Design is kept pretty simple and decent yet classy.
Overall value for money and you will get best deal in this price range.