Works well and with excellent speed. I used this to format a SATA SSD and retrieve large files from it. Tip: search for the Disk Management utility on Windows 7 and 8 systems, to format drives and make them visible/usable. No instructions come with the adapter. It even works with my SSD without requiring the external power supply (included) to be connected.
I've never tried to install a large USB drive onto a computer. The Unitek adapter made it much easier, no instructions necesary. Just plug in, and it's ready. It is backward compatible to USB 2.0. It was a great choice for my needs.
Julian in AZ
worked like a charm is a wonderful back up tool
83-11863 - Two Port USB 3.0 Interface Card 34mm ExpressCard
Provides two USB 3.0 portsBackwards compatible with USB 2.0 and 1.1 specificationsSupports up to 5Gbps data transmissionWindows® XP/Vista/7 compatible
RE5119C099-C702 - DVD Module
MCM is a great company. Very fast service and shipping of Raspberry Pi. Will tell all my friends to buy from MCM