Tested with an iPad 2 with iOS 6 with SDHC cards - there the adapter works perfectly. The only complaint: It does not lock as precise as an original accessory from Apple; a little jerking may already be necessary until the adapter is seated properly and is also recognized by the iPad.
The other functions (USB connection, micro SD card slot) I have not yet tested. But the price-performance ratio as well as already is absolutely fine - compared to the original adapter. Given also 5 stars, despite the somewhat shaky contact.