Works a treat on ipad3. Bought this despite some negative reviews because of the price. Some comments that might be useful. 1. If using as card reader make sure you switch the little switch to card mode. 2. Be patient if you have a full card. I tried it with a nearly full 4gb SD card and I initially thought it wasn't working but the iPad doesn't seem to open it until it's created thumbnails of all your pics. 3. If you want a quick way of checking it is recognised, first open photo's on you iPad and then plug it in. You should very quickly see a camera menu appear at the top. If you have a lot of pics it will take time to open all but you can see it working rather just think it's not recognised.
Other points, also let me open pictures on an iPhone by plugging the iPhone into the USB. It wouldn't open my android device over the USB, but hey for 3 quid, can't expect everything I suspect the real apple one wouldn't either. :-)