If this device were a gymnast it would have slipped awkwardly off the pommel horse, ripping its leotard, and cracking its leg on the dismount. I thought this was the niftiest thing in town when I bought it. I display its coiled exterior prominently on my desk hoping other dorks would marvel and admire it. My phone, which was off during the "charging", had gone from two bars to a mind-numbing, brown-out inducing, three bars after 9+ hours. Data: the USB port charging it was directly off the motherboard with no other devices daisy-chained to it or connected to the other port. This same phone and battery go from nothing to fully charged after 45 minutes on the AC.It works in the tightest of pinches, but it's a disappointing performance.