I have a Solio solar charger. It works fine if you plug it into the wall, but a total POS when you leave it to solar charge. Takes forever on a sunny day, doesn't charge for $hit on a cloudy day. You wind up carrying around an extra cable to charge a solar powered device. Oh, and using your window to charge on a plane? The Solio is designed to stick on a window. You know what they call people who stick electronic devices on a window at 30k feet? Terrorists
FAIL
Yeah good way to attract attention of Marshals. I just bought a second battery from Verizon...works good for me.