I just bought this a week ago. Apparently to charge at full speed, the data pin outs on the USB connector need to be shorted. This tells the phone to go into ac charging mode. I opened the charger up and it does not do that. So I had to buy a cable that shorted the pin outs. So far, my phone still doesn't charge at full speed. I'm not sure if it is the cable or not.
Also while I had the charge open, I noticed it did not have a fuse.