The Kingwin EZ-Dock makes transferring data to and from both 2.5" and 3.5" hard drives as easy as possible. There are both USB and eSATA connections available to you, which is great since eSATA is a lot faster and becoming a standard now for external data. Performance-wise, the Kingwin EZ-Dock was on par with the Thermaltake BlackX via the USB connection, however the presence of the eSATA allowed for faster transfer speeds. While not as fast as being connected to the internal SATA port, the eSATA speeds were a nice jump from the crawl of the USB speeds.