The BlacX 5G is a welcomed upgrade to USB 3.0 from the BlacX Duet which was just USB 2.0. gives you the ability to hot swap out SATA drives and gives you the speed of having the SATA drive connected via a SATA cable to the motherboard. This is a welcomed upgrade to all those I.T. techs who deal with stacks of hard drives and need to search multiple drives for misplaced data or image drives quickly.