So these units are awesome. You get about 3-4 full iPhone charges, it's shaped just like the iPhone, and the cable is integrated into the unit, so it sits nearly. Shake to turn on battery status LEDs. Charge with MicroUSB. One spare full-sized USB port for charging other devices. I bought mine for $90 and I'm happy with it at that price. $56 is an absolute steal.
The unit is also available with integrated MicroUSB for Android devices, but the thing is essentially designed as an iPhone accessory, and us poor iPhone 5/S users all have battery issues so I'm linking to this listing. :)
You paid $90 for a 6000mAh Power Bank??