I recently swiched from samsung power bank to the Mi because my friend suggest me for it. Firstly I liked the look of powerbank and it is of respected company mi . But after few days it was not working good . It takes lot of time for charging and do not have much time for it .If you are daily worker with mobile you need a good quality powerbank for charging the phone but Mi powerbank is must not your choice . And the second drawback of this is that it is much expensive than other company powerbank. According to me following are the improvement in mi powerbank .
1) BATTERY : - The quality of powerbank should be very good for daily workers with mobile . But mi powerbank battery is not lasts for long time .
2) PRICE : - Middle class people needs less expensive devices for daily work . But Mi company made the price higher than normal . It's value must be less than now .
I will not recommend you to buy this product . You must go for other powerbanks which are cheper than this .