My boss is looking for some portable power for iPhone and iPad charging while in transit for vacation soon. He found this in the Apple store. $80 5400mAH, 5.71 ounces, 2 iPhone charges. Incase Portable Power 5400 - Apple Store (U.S.) I cant help but think its over priced and doesn't pack much juice for the money, but I don't know too much about these gadgets. Any advice?