Xiaomi redmi note 3 is among the best androids under Rs.12000. the sound quality of the phone is good and it is not so difficult for a new user to use it even xiaomi provided a "Beginner Setting" for the device if someone is new in using xiaomi. I have silver covered mobile and I think it is the best colour amoung three. every thing is just perfect but there are two problems with the phone.
phone does not support many of AUX.
the charger stop charging the device after 2 or 3 months.
recently in MIUI8 update xiaomi solved the AUX problem. but the charging problem is still unfixed.
but if you face a problem related to charger than you can exchange it from xiaomi center.
so overall its the best MI product in this range.