I have purchased MI LED 4K display Android TV few months ago and I must say it is a bad choice.
Size and interface:
I am using 43 inches display MI TV. It doesn't have very good interface, it doesn't detect Wi-Fi so accurately and the keypad they provided is very hectic to use the TV hangs a lot.
The size of TV is not that satisfying it is not so slim from behind.
Apps:
it will give you patchwall which doesn't have too many Android apps you need to gradually update your patchwall to get those apps still so many apps are not available on patchwall aur Play Store of Mi Android TV.
Display and Remote:
The displays quite irritating it has colours which are not so pleasent to eyes.
the remote the provided runs with bluetooth which you have to pair with your TV and again it is not that good.
The Google assistant button on the voice input button is is not show accurate to catch the voice.
And the keypad is very irritating it takes a lot of time to type.
Sound Effect:
the one and only good thing about this TV is it has a very powerful and impactful speakers which will give you the feel of home theatre.
Advantages:
There is no major advantages of buying this product except that it has Android operating system and a powerful speakers.
Disadvantages:
It causes pain to eyes.
Needs very high speed internet.
So many apps are missing.
Not able to justify its price.
Remote is very bad to detect voice.