Afunta (tm) Apple-style USB 2.0 Ethernet adapter - Compatible with Apple MacBook Air, MacBook, MacBook Pro, iMac and Mac Models - Replacement for MC704ZM / A (Personal Computers)
For the price it's not bad at all. Recognized by my macbook air, there are just a plugger does it work, we had to 100Mb. After the device is rather cheap, the USB cable is thin enough, the case heats a little ... I do not know if it lasted a long tim