Was somewhat hesitant to buy with all the forum talk about difficulty to make Mac recognize the hardware. At first I to had the problem, however,buy pulling it out and back into the USB port Mac found it and it works. However, because of the new os 10.7 lion I have had much problems with the recognition with this device. If you want one for use as a dongle for your ethernet then stay with os.10.6 snow leopard. ESP. With MacBook air. As apple tech mentioned they use it for computer to computer file transfers an not as an Ethernet device! Interesting!