I glad to say about mi band experience. My mi band is very good. I use every day to calculate my fit. Best part is 0.5 mm battery going 15 days backup to use.
I used various types of band but my one of the favourite mi band.I bought from mi.com in flash sale at RS.999 at low cost say about the feature of this band he is connect your own device. A software from mi band he connected via Bluetooth. He is showing one week our feet and another vibrate like alarm. I suggest go and get it.