Mi 4 is the new smartphone designed after the succes of mi3 model. this is the best phone I would ever had. superb camera quality it can take great selfies, but sometimes tap to focus fails. decent camera filters and in low light condition image may get blur. though still we do not get the latest version of software by the company, the older version kitkat works great! phone feels slightly heavier in hand but due to less width of display we can easily handle phone without any worry. loudspeaker is slightly low as for I notice. it is very difficult to notice incoming call if our surroundings are little bit noisy. IR blaster works well. Due to awesome 2.5 ghz procesoor it can play any kind of high definition games joyfully but with high graphics games like nova3 my gets heated rapidly within 5 mnts of gaming , after 10 mnts if continuous gaming my phone turned to heated up in such a way that it is difficult to hold phone. it has 3gb of ram so it can handle multitasking easily without any lag. but I can notice some software bugs here and there, because I am getting some errors while operating my phone. when we compare positive and negative we can say that this is the best smartphone considering this price segment though it has some negatives those are very minor when compared to positives.