check out how much they all cost too Rain! Ken said his model would cost 37.95 and if it's better than the $20 one they have listed on that site it'll be a big hit!
After reading the reviews of those chargers, let's hope Kenergy's solar charger has worked out some of the bugs the others seem to have. I'll assume there must be something proprietary about it that warranted a patent. If this is better than the competitors' devices, it could be a huge seller.