Firstly, its using very high amount of RAM( 1.54 GB out of 3 GB) without installing any app. Xiomi should specify it in the specification itself.Secondly, the device gets too too hot as if it will blow out.Thirdly, the low light camera quality is very very poor.
Moreover its Update is available around 1.4 GB when you download and install the update, it will ask for reboot and after reboot it didnot get start.If you start it continuously it will show mi logo for around 48 hours.
The back sensor does not work properly and the phone remains unlocked and get hang for several hours when you try to unlock it with a pattern
Even the power button does not work properly.