I've had one for two months now and it is still working great. I use it most night for reading my kindle in bed, and place it in the window again in the morning - so it never runs out of charge.
It's really lightweight and of course comes with no cables, so you can place it anywhere. I think it's cheaper and better than almost all the kindle lights, and you never have to pay for new batteries.
Also, it comes with its own USB cable, so you can always charge it or use it that way too. I might get one for my nephew to get him interested in solar energy - and because he doesn't have a bedside lamp at the moment.