I am using this phone from September 2015 and its been about 4 months since I am using this phone.
Its an awesome phone as compared to all phones at this price point. so first of all it performance: performance of this phone is awesome. as it is having 2 gigs of ram and a quadcore processor.
You will not feel any lag it also graphic intensive games like asphalt 8 . dead trigger 2. and many more very nicely without any lag. its ram management is also very good when I booted it for the first time I got up to 1.4 gb of ram fee out of 2 gb which is very good as compared to all other phones. camera quality is also good you can see the sample photo. now lets talk about some problems.
1st thing is update. this phone is still running on 4.4.4 kit kat. but this is not a problem for me xiaomi is regularly updating it’s custom built rom MIUI which is wonderful rom I have ever seen until now it’s latest version MIUI 7.1 is running on 4.4.4 kit kat. but it is very much better then other phones running latest marshmallow. so its not a problem for me. MIUI is very fast, having awesome UI and god of customization. really. so this are my thoughts about this phone.