I am used this phone frome 5 months and I never faced any problem from this mi4i. Is excellent phone in my openion . I played asphalt 8, san andrias, and many heavy games there is no any hanging problem game plays very smoothly. Its camera is very good and the frount facing camera is owsem . Miui of this phone is realy good there has lot of feathers . The waight of this phone is very light . And the body thickness in very slim.