I am using redmi from redmi1s and using its all the products.
recently I purchased this product and I am very happy with its performance
its smooth
got miui8 which is the latest one and the smoothest one
in addition it got 3gb of ram so no over heating no crashing of apps and real smooth
the fingure print scanner is also great and smartly placed
when you get the device its on lollipop but due to miui it give you all the features of naugat
further if you want you can up date it to marshmallow
it is having hexacore processor even my pc have quadcore so this device is real ast and smooth with snapdragon 650 and 64bits processor
and 1.8 GHz of clock speed