iPhone powered by the sun

Technologies for making use of solar energy are constantly being developed to improve efficiencies and broaden their use. Specific products are being made for today’s consumer electronics such as the iPhone. There are existing chargers available, ie the Novothink Surge, but one interesting concept is the iPetals solar charger that folds out in the form of a flower for maximum area and when  folded up it acts as a dock.

Have you tried a solar power charger, what was your experience?