HI. My friend is using this phone for last 2 months. I am writing about cons only. Apart from this cons all other things are awesome. battery life for moderate use is 1.5 days and heavy use 1 day. and now got MIUI8 Update. its awesome. And its superfast. No lags on heavy usage also. Its gr8 deal for 12K INR. Go for it.
Cons :
Camera quality - Poor in low light and zoomed focus
Slippery due to smooth back. u have to put some grippy rubber case.
earpiece gets warm( Not hot) for long duration calls with wifi on
charging time is more. no quick charge
some minor bugs in whatsapp like after downloading video I have to go back and come then only it plays
Audio quality in loudspeaker is average , but with JBL T150 earphones it awesome.