Works great on my 2011 Macbook Air,
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This review is from: StarTech.com USB 3.0 to Gigabit Ethernet NIC Network Adapter - 10/100/1000 Network Adapter - USB to Ethernet LAN Adapter - USB to RJ45 (Personal Computers)
I have only had this for a day, and I usually wait a while to post a review, but I am very impressed with this product.
I'm using it on a 2011 Macbook Air, that only has USB 2.0 ports but it still works great. I can copy a 2.2GB folder in about a minute from my macbook air to a server across a gigabit ethernet network. By comparison the wifi n (150Mbps reported connection) will do it in about 5 minutes. In normal use (web browsing, email and remote access) it does seem snappier than using wifi, and I'm not getting dropouts that happen on occasion with wifi.
To work on a mac you have to download the drivers but it was easy to install and took about a minute.
Its a bit larger, uses cheaper plastic and its not as "sexy" looking as the apple usb to ethernet adapter (which I have also used). However it is gigabit and does seem faster, not that I had any issues with the apple adapter, its also great.