I got redmi 3s prime on 15th jan 2k17 and till not I had not got any problem with this mobile. For a few days I had lost my charger because of that I had some slow charging issues. But its the best mobile in 9k range with a vey fast fingerprint scanner compared to any other mid range mobile.
The main pro is the camera of this mobile the lense is very nice. In my mobile if I charge full once it will last for around 30 to 35 hours with internet usage. But a small issue is its over heating. Mobile will heat if we play heavy games like ashault 8 etc.