Doesn't appear to be that many people who have exchanged / reported back on it.
Word from various forum posts is that they'll give you a USB adapter that came with your device.
If you've an iPad 3 they'll give you a 10W charger. Not the 12W that's on the shop floor. It'll come in non-retail packaging for you.
The luckier (and rarer ones) report that they got the 12W charger.
If I had to hedge, you won't get an upgrade of your charger, just another one similar to the one that came with yours in a non-retail packaging.
Process takes 45 minutes because it's ultimately a genius appointment (after you've spoken to an employee who knows how the exchange program works).
Word from various forum posts is that they'll give you a USB adapter that came with your device.
If you've an iPad 3 they'll give you a 10W charger. Not the 12W that's on the shop floor. It'll come in non-retail packaging for you.
The luckier (and rarer ones) report that they got the 12W charger.
If I had to hedge, you won't get an upgrade of your charger, just another one similar to the one that came with yours in a non-retail packaging.
Process takes 45 minutes because it's ultimately a genius appointment (after you've spoken to an employee who knows how the exchange program works).