Wanted to add an additional note after I submitted my initial review. This adapter does not support 802.1q so no VLAN tagging.
My Mac was happy to provision the interfaces but then they just don't pass any traffic. Swapping it out with an older Apple 100BT adapter and the tags work fine. May not be a factor for you unless you are in the networking space but might be important for some folks.
I'm still giving it 5 stars because overall it's a great adapter. Just don't find out about the lack of 802.1q support the hard way (like I did).