Hii, I am using Redmi note 4 since one year. Sound is good. Operating system is simple to use for all. battery backup is amazing up to two day. battary if 4100 amh which is best in the market. Camera is quit good but front camera good. Heating problem mobile$ charger during the charging. Look is also good with finger sensor.it is value for money. I giving for this product 4/5 rating.