After 6 month using these phone here my reviews
Pros
Build is perfect. Unibody design . slim just 7.8 mm Amazing full 1080p screen look gorgeous. With all new Sunlight display. The colors of the display is very good. Good battery life massive 3030 mAh battery. Fast Octa core processor with android v.5.0.2 lollipop
Cons
Slight warm just normal usage. After update of miui 7 heat problem solved and no expandable memory card slot.
Overall good phone in the price of rs 11999( mi4i 16gb)