My impression: The adapter is great processed and has 3 USB 3.0 ports that make just the MacBook Retina perfect sense. This is namely equipped rather meager with only 2 USB ports. The USB cable is unfortunately rather "stiff" should definitely be a little longer. The installation runs (at least on the MacBook) automatically. I had to download the latest drivers on the website and install the adapter manually. After 2min I was done with the installation and the system has recognized him as a new LAN adapter.
Function: The adapter is now for 6 months daily at least 8 hours with me in action.. So far I have not experienced any difficulties. The performance is measured with 976 Mbit / s really top notch.
Conclusion: A great retrofit adapter of a LAN interface, while also expanding the meager number of USB ports on the MacBook!