I have been using redmi note 4 4gb variant since 4 months its just awesome.Here are some pros and cons of this phone.
Pros: -
1-build quality is superb with metal finish the two lining on top and bottom makes it more attractive
2-sound quality is awesome, some phones have speaker on its back so when you krrp them on table u cant hear the phone ringing but with redmi note 4 it has speakers on bottom which is always audible irrespective of conditions.
3-very smooth processing with its snapdragon 625 chipset
4-fingerprint sensor is too fast in respond
5-gaming is very smooth, played high graphics games without any lags
6-Battery backup is awesome if u r a average user it will surely last upto 2 days if fully charged but remember gor better battery life never charge the phone more than 80percent or less than 20percent.
Cons: -
1-u cant get perfect screen guard for this phone as the phone has 2.5d curved glass
2-camera quality is not up to mark no doubt its better than the previous variant redmi note 3 but not upto expectations