I am also intrigued by the HyperJuice Stand. The stand with its incorporated battery seems to have several good things going for it, a stable iPad stand, up to 16 hours of back-up battery, and several other interesting features. The one thing that causes me to pause is the price, usually $150 USD (currently on sale for $130 USD).
I have bought several items from the company, an external battery for my MacBook Pro. It has performed well during my last two trips to China. The company's prices for their products seem a little high.
(link removed because of my low post count.... google "hyperjuice" to locate site)
YMMV,
boomer