I ve bought this powerbank on 4th ocober.using for more than 1 week I have to say its having a pretty good battery life.By using the powerbank fully charged imm able to charge my iphone 5s 6 times.the battery capacity is pretty good.talking about the desing, it is having a sleek mettalic body.imm having the red colour and I have to say the colour is outstandingly beautiful.i ve bought it on mi diwali sale for 799.for the money I paid this product is excellent.about the durability of the product its having a pretty good durability because its made of mettallic body.in my opinion if ur looking to buy a powerbank ill recommend buying mi powerbank.