I am going to express my own experience in redmi 4th generation
It is a budget mobole which provides vast specification at minimum cost
It also provides 2gb ram amd 16gb internal storage and allows the user to expand upto 128gb
It provides a battery back up upto 36hours with 3300mAh lithium battery
The slim design and mettalic body provides less bodu weight and enriches the design of the mobile
The android version mixed with MI OS makes the mobile to be more user friendly
Thinking of other features it is a 4GLTE supporting mobile and 5inch screen display with snapdragon processor
It is 100% valuable for money