I bought the mi4 3 days ago and so far Ive tested the performance, camera, gaming, media and I updated the phones software to miui 8. This device has so far given me no problems at all. The battery life is great. It sure does feel like a premium device. Xiaomi did good with this phone. No memory card slot is not a problem for me as this phone has OTG support. Overall Id give this phone a 8.5/10
Its an awesome phone from all corners bt its camera could be develop bt its ok to capture. this phone has no compass bt other features as well as superb. Battery life is strong and battary backup depends on ur use per day. its screen size 5 its means it must be handy. but cons are the Redmi 4A introduce hybrid slot(3 in 2) use. nano sim/microsd+micro sim. u get 16gb internal where u can get usable memory as 10gb something. u also get 2gb ram. its an awesome for constant uses. overall its jus a good phone to have.