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MIUI means Me + Ui. Me means my and yes after using MIUI from past 3 years I surely say that it is a UI which go beyond the levels of the UI's to give you an experience of customisation and performance.
miui is a friend to me because i had only three phones till now nd all the phones were of mi. so i didnt use any other UI or stock android. but anytime i use miui it gives me whole new world to explore through its various features nd amazing user interface nd simplicity. miui is all about less is very more.