I am using this power bank since 5 months.
The battery life of power bank is really very poor, because it only gives output of about 4000 mah. When they have written the output is 6500 mah on box. It charges my 4000 mah phone only once.
Design is ok as its is slim and portable but the size can be reduced little more.
No value for money here because they dont provide the quality. In same price you can get better output power bank from other brands.
The body is made from plastic it is little durable and tough.