I have used it like a year and I was very happy with custom ui which is called miui, miui gets you regular updates and it also gives a premium look and lots of customization to the user.
It’s not unlike stock Android but it’s a bit hard to operate for new users, this heats a lot which I think is the major drawback of this phone and for those who loves gaming this phone is not made for them, great sound quality like Sony and I m quite bit of surprise with camera’s performance it did very well in daylight but seems fine in low lighting conditions, battery life is average, so guys of you don’t a gamer guy then go for this xiaomi wiil give best sound quality im low budget and if you play games heavier then this phone might be not for you.