I have been using Mi Band 3 since long and now I am going to share my own review Of it.I really had an terrible experience with Mi Band 3 which completely disappointed me.One of the major drawback of Mi Band 3 is that the touch sensitivity of screen is very inconsistent, it does not respond quickly to the command which can br be really annoying.Display of Mi Band 3 is also ruthless outdoors.Even in mild sunlight, the display is hardly visible.It takes very long time of almost 3 hours to charge the Mi Band 3 which according to me is very long to charge a battery if just 110Mah.Tracking accuracy of Mi band 3 seems to be very inaccurate, Sometimes, it counts false steps which you even does not walk which can causes disruptions to the stats of the user.Some of the limitations of Mi band 3 are as follows.
1) .The biggest drawback of MI band 3 is that it lacks a display, you always have to have a mobile phone in order to use the Mi Band 3 which is not convenient all the time.
2) .Mi Band 3 has compatibility issues with many phones, your phone should have bluetooth 4.0 and android version 4.4 and above, which means you cannot use it with old mobiles.
3) .You have to keep your bluetooth switched on all the times when you want to live track your fitness which is not convenient at all.
4) .Mi band 3 does not synchronize quickly with the phones.sometimes, it can be very slower.
FROM MY PERSONAL EXPERIENCE I STRICTLY RECOMMEND NOT TO PREFER Mi band 3.