If you’re looking for a phone in this price range, don’t even hesitate buying this quad-core beast. The battery is 3000 mah which is used efficiently by the processor and does manage to run whole day in single charge. Heavy games like modern combat 5, fifa 2015 also run smoothly without any lags.
The operating system is best customized version of Android and mi themes are simply amazing and change the way your phone looks entirely. There is no other theme engine which comes close to mi theme engine. Also it has most customizable os.