Plus, I didn't know if it would or not, but also tried to see if I could connect to the internet through the adapter, and couldn't either, as the USB port has it's own IP address or something.
Brought it home, plugged it in to both computers, and it said the transfer time would now be over FOURTEEN HOURS long! What the - ?! That was plugged into the right (display port and card reader side) USB port, and didn't try the left (power adapter side). I got it pretty much solely for a faster transfer speed using Migration Assistant, versus the nearly five hours it would take for me to transfer 38+ Gb of stuff from my iMac to the Air via AirPort. I just got the USB Ethernet Adapter today from my local Apple store.