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Miui 5 comes to my mind whenever i think of miui. It was my first Android custom skin and i must say i was amazed by its useful features which no other android rom offered. Be it call recording, taking notes while u are on call, app lock, hidden files are few to name. One more thing at that time, there were not so many OEMs offering such customization out of the box. Miui is perfect blend of customization, handful of good features nothing more, nothing less.