After sleeping on it, I started wondering if I should really be looking for the cheapest. These are after all lithium ion battery devices. Poor quality batteries have been known to develop internal shorts and thermal runaway resulting in fires. Am I going to be wondering about the safety of the power pack every time I use it for as long as I own it?
My mind was put at ease a litte bit by their website
http://www.aibocn.net/about-us_a1.html
which states
"All of our items reach the strict standards of quality assurance by CE, UL, and ISO9001/9002 certifications.".
Here's a video that I think is the same product.