I have read some reviews they are saying the phone has battery issue.i want to ask them are you kidding.I personally insisits to buy the phone atleast for battery.I have been using this phone from 5+ months and it has not given a single issue not even heating.
But sometimes after long use the fingerprint sensor do not respond properly, but its just one point where the phone does not perform properly.
And it has a very great camera quality both front and back, based on Miui the phone gets regular updates.Now I am using Android M on my 3S prime