Pros: 4 bays, usb 3.0, takes up less space and power outlets than single/double bay docking stations. Windows 7 sustained transfer rate between bays 40+ MB per second, these are large hundreds mb size file transfers not the small kb files.

Cons: Individual bay power switch, when power off one bay, the usb connection for the other bays also resets. This means that when i power off bay 1, without going thru windows' "safely remove hardware....", the other 3 bays status light flashes and Windows 7 reported media disconnect and found new media for the other 3 bays. This makes me question how safe is to use the individual power switch. If you ask why would i do that, it is because I cannot individually eject each bay or each docking station from windows. I think it is due to my 4 port USB 3.0 card, my only option is to eject all connected docking station in Windows Safely remove media.

Overall Review: The docking has been powered on 24/7 for the last 30 days with 4x2TB drives and it is still working now. Only preformed normal read / writes between drives. I received item in jan 2014, it came with a US power cord, not like the other review wrote in early 2013. I have not experenced drive dropping out, but you should keep in mind the total current (amp) consumption for the 4 hd does not exceed the current output of the power supply. And i would not do intensive disc task to multiple discs at the same time, it is only 1 usb3.0 port feeding the 4 hd. This product had been out for a while, i don't know why there weren't any more reviews. So i wrote this.