I purchased mi band from mi store for 799.
It is cheap than other brand bands but I assure you it’s good.The battery performance is damn awesome it lasts approx 20 or more days.It have a light weight, military grade sensor which are very good.At this price point this is the best band.But the problem is I found bit of hard task to sync it with other than mi apps, I have mi4i and have an account so I downloaded mi fit app it connected easily.But when I tried to connect it with other phone of different brand with mi fit app I found creating an account a big task and every time I failed so I decided to sync it with my mi4i as I already had an mi account.So the guys who don’t have mi smartphones can face some problems