I purchased the Redmi note 3( 3Gb ram, 32gb rom) from amazon.in from flase sale and within few it shows some lag because of highly customisable MIUI 7, the fingerprint sometimes doesn’t work properly and when I insert my SD card in the hybrid slot the phone just hanged and switch off and reboots.
But this phone has some cool features like app lock using fingerprint scanner and taking selfie using fingerprint scanner as well as some new features will be added to it as the new MIUI8 with Android Marshmallow updated is about to release probably on 13 june 2016, for detail features of MIUI8 pls use the description- https://youtube.com/watch?v=v0hI_Q6ZxJs