Pros: Sata III works as described, fast and smooth. I tried it under Windows 8.1 and Mac OS X Mavericks 10.9.1

Cons: USB 3.0 does NOT work as advertised - It runs at 2.0 USB speeds I tried it under Windows 8.1 and Mac OS X Mavericks 10.9.1

Overall Review: Contacted customer service a week ago - still no response. This card needs updated drivers for both Mavericks and Windows 8.1 and or a firmware update to get the faster USB 3.0 speeds.