Redmi note 4 is one of the great phone in case of its metal body. But if you are a Redmi note 3 User then it does not matter.Your Device is better then Redmi note 4 in turms of battery and all but redmi note 3 do not have 4 Gb ram so it is a bad thing you can say. Redmi note 4 Comes with android marshmallow but its Nougat beta testing is on way. So You will get latest android version in it.But still Redmi Note 4 is a great device you can buy this if you are not a Redmi Note 3 user or you need more Ram in your Device.