I bought this on the off-chance that it might work and could not be happier. Charging my e-reader from the computer USB was getting to be a nightmare. If your reader has two, almost full, memory cards (around 800 books)it takes ages to reset after a charging session. Sometimes I had to plug it back in again for an hour and do a re-boot. However, now I have this handy little charger there is no problem. It charges from zero to full in less than an hour and I can even carry on reading whilst it is charging, something not possible if charging from the PC. Sony charge around £20 for their charger and it is big and heavy. This little charger is light, portable, handy and for the price, brilliant!