I bought this for iPhone 6
I have been using this for a month... No issues till now.
But even after once charging my phone(from 10-100%) , power bank is still showing to be 75-100% charged.

Packing: Was in company packing, neatly done, with easy unboxing and ready to go out of the box.

Design: 10/10
Weight: 9/10 (well it's 5200mAh)
Size: 8/10
Indicators and other functionalities: 10/10

The external battery performed well charging my devices. I have tried to charge

♦ Nexus 5X
♦ Nexus 6P
♦ ...