I have been using this phone for the two week and I must say I am more than satisfied with this phone. First of all I am going to state that "it is best in its segment". Sound reception is very good and active noise cancellation work very good in this device. Well speaking of sound the loudspeaker is not very loud, for an example when I left this phone in my room and went to adjacent room, I did not not able to hear the ringtone when its rang.
despite of that I must say this device is one of the best looking phone in the market now. Xiaomi did take a huge leap on the design. And all the sensors are working as they should be especially the finger print sensor on the back which is giving 0.2 second of response time which is great. And the greatest of all it has octa-core 2 ghz snapdragon 625 processor which makes it very fast. and certainly with 4 gb of ram it is not going to lag anytime soon and with 64 gb of ram you have enough space on your phone to simply let of the tension of data storage problem we had with other devices.
It runs on Android Marshmallow and comes with MIUI 8 which make its incredibly easy to use without and confusion, literally a 12 year old can use every function of this phone.
And the build quality is very good, it is quite sturdy and reliable and the cherry on top, this phone got a phenomenal 4100 mah battery which give around 12-15 hours of screen on time. And if you do not use mobile data or wifi it will last upto 2 days on a single charge. Speaking of charging one this that is missing is it does not support fast charging so it may take upto 5-6 hrs if you charge starting from 4-5% upto 100%.
And I saved the best thing for the last, CAMERA. Both primary and secondary cameras are very good in natural as well as artificial lighting, despite having 13mp and 5mp respectively they shoot beautiful pictures and record in HD.
My opinion for this phone is that it is 9/10 in terms of value for money which is quite good.
Its a best buy and no one can regret over this phone after purchasing it.
Thank you for reading.