Redmi 3s Plus is a low Budget Smartphone with many good Features which You get in High Range Smartphone.
Firstly I would be Telling about its Pros :
Battery Life : It has got 4000 mAh of Battery Lasting upto one and a half Day With Average Usage.
Design : Premium Design and feel Expensive when hod in Hand.
Performance : It has Got Snapdragon 430 Processor which is Octacore and is First Device to house this Processor, which Provides Really smooth Performance.
Camera : It has got 13 Megapixel Rear Camera and 5 megapixel fron Camera which Perform Better in Low Light as Compared with cameras of other smartphones in this price range.
Fingerprint Sensor : Its Fingerprint Sensor is really very fast and responsive
User Interface : It has got MIUI 8 based on Android Marshmellow whis is Fast and secure as Compared to Stock Android UI.
IR Blaster : It Has got Infrared Sensor which we used to get in MI4 Smartphone of Xiaomi. You Can Use your device as a remote Control Of any Other Electronic items Such as TV, AC, etc.
Touch Response : Its Touch is very Good and Responsive
Cons :
RAM : It has just got 2 GB RAM which is really very much less as compared to Applications Now a Days
Speaker Location : Its Speaker is of Good Quality bit its Location Just Halves its Quality as its located at the Lower Back Of the Smartphone which Depress the Voice.
Screen Security : It has not Got and Gorilla Glass or Dragontrail Glass which means that its Screen id Fragile.