Hello, friends I am about to tell you my own experience with my xiaomi MI 4i which is an atom bomb among other phones at this price. It has up-to 1 year of usage without being any problem which I faced in other companies. As well as I used up so many brands of phones which are said to be throw them all in flush. I am not telling it is the best best best phone but just want to say killer phone at this mid range for me. The phone is working very smoothly and have no issues regarding it’s customes because you get better cameras for pics, good. Ram, nice storage and good gorilla display. Overall the phone is best and does not lagged on working yet.