Xiaomi is a chinese brand but is popular fot its mobiles and their features
Redmi note 3 is very good phone
Design: -Its design is very sleek and slim which looks good in holding.
Featues: -It has many featues like dual app( depends upon miui version) in which u can run clone of any app without downloading any app like parallel space.
Finger print scanner: -very fast response and good in use.
Operating system: -it works on android but it has its own build-in operating environment called miui which is very good and user friendly
Battery life is also good
Sound quality is also very good
Performs well with high end gaming
Problems: -
camera is average.
It has hybrid sim slot means u can use only 1 sim with sd card or 2 sims without sd card
Only one sim can run on 4g but u can use 2 sims by 1 on 4g and other on 3g
OVERALL: -overall its a very good phone in this price range and u must buy it