Best results would be to pair this product with Apple 10-Watt USB Power Adapter for iPad (A1357) and 15 Foot USB 2.0 Extension Cable into the power port. This would allow full current to pass through to the iPad while simultaneously allowing data to flow between the iPad and computer (though limiting laptop users' mobility.)
Explanation: You won't get full iPad charging speed off just a computer's ports. USB standard puts out 500mA per port; combine two for 1000mA. The iPad charger puts out 2000mA. Therefore, feed a high-amperage charger into the power port for full charging speed. Supposedly, some 3rd party iPad chargers above 2000mA actually charge *faster* than the Apple charger. Consequently, using this cable with the iPad charger at 2000mA and a computer port at 500mA might decrease your charge time overall.