I am using this for a couple of month also I have mi band though I used to buy it as a Indian manufacturer YU but really its disappointed me a lot so much inaccurate and also the bonding of Bluetooth is too poor always show disconnected and lots of error it has its has o oled display and good for a fitness traker but as the display consume lots of Battery so the battery performance is also not so good rather then use it for fitness traker I use it as a stylish watch and it is.
If you want a stylish watch with oled display go for it but as a fitness traker its a worse I think so I not recommended it for buy as it is inaccurate