The Apple Thunderbolt to Gigabit Ethernet Adapter lets you easily connect to a high-performance Gigabit Ethernet network. Small and compact, it connects to the Thunderbolt port on your Mac computer and provides an RJ-45 port that supports 10/100/1000BASE-T networks.
Reviewed by 2 customers
We use this with a MacBook Pro with Retina display, which doesn't have an Ethernet port. This gave us the functionality we needed. It works perfectly, we can't even tell the difference between this and a native Ethernet port, even with our high bandwidth connections.
The only disadvantage to this product is its price. Should probably be included with the newer Apple laptops. No problems otherwise. Getting gigabit speeds (minus overhead), and way faster than the USB-ethernet adapter.