Solar lights need not be in your comparison, because it's a beast of a different design. Solar lights use a solar panel to charge the battery, whereas the wireless charging pad uses an induction coil to create an electromagnetic field. The other issue with your comparison would be the quality and type of batteries.
I wouldn't be one to buy the first generation of wirelessly charged e-cig, due to obvious reasons such as unproven technology. However, give it a year, and I'd be one standing in line.