Amazing speed. I got full gigabit speed between a Macbook Pro 2013 laptop and my Intel n3700 machine. I can definitely recommend this over a USB ethernet adapter, as long as you have an older Mac that uses Thunderbolt 2. Yes, this is Thunderbolt 2. It’s the shape of a mini-displayport. It’s NOT the thunderbolt 3 shape of USB-C.
https://www.amazon.com/Apple-Thunderbolt-Gigabit-Ethernet-Adapter/dp/B011K4RKFW

