Many people have learned that the iPad requires too much juice to charge effectively from a USB cable. That is an annoyance for many. While the iPad will say "Not Charging," the truth is it is drawing some juice, which is better than having no power supply.
Like others, I thought this dual USB cable would double the juice and charge the iPad effectively. No dice. It does speed it up a little, soit may be worth it for those of you who really need to charge while you sync, but it does not get nearly enough charge to get to 100% in a reasonable time frame.
Still, that is not the cable's fault, and it works as advertised for a cheap price. It is better than a single cable, so I recommend it if you just want to get slightly better charging from a USB.