I have purchase this Xiaomi-Mi Band before 2 month. I have use this band daily. I LIKE the band. Beacause this band monitor your activity and monitor you sleep quality. The build quality is also good. But I think the company give also a monitor screen on the band.
The battery backup is also good the band will give you backup of 25 days easily. The band is comfart in hand and also light weight. This device connect via bluetooth. Its come with 1 year of warrenty. So the band is good. But the best thing of this band you can use as mobile notification this band vibrates when any call or notification recive. This band also use for alaram so I think this is good fitness band in this price range.