The unit is very nice looking out of the box, but the case seems to get scuffed / scratched very easily after some time in my backpack. I really like the small, compact, size of this device.  Even with the small size, this pack still charges my iPhone 5 well over two times - that's the main purpose, so you can't complain.  It's the most portable New Trent device that I own.  The on/off power button seems to stick a bit when you try to power the device on.  It will usually turn on the second attempt.  Would it be possible to improve this switch to allow it to slide back and forth?  I would rate this device a 4.5 out of 5, and the only complain being the power button.  This provides an excellent amount of power for $40.