I purchased this phone for my friend a year ago.
Initially everything was ok but later we discovered heating issues in the phone.
If you are running a heavy application or a game then the phone starts heating and there is a point when if you go on running the application then you cannot hold the phone due to heat.
Same was the case while charging the phone.
At the time of charging the phone heated badly.
Otherwise it is an average phone with good design and body but its negative points override the good ones.
Its predesseser mi3 is a great phone and it had no issues like these.
Xiaomi is a trusted brand and it should take such issues seriously for further products.