Short bio: Computer Scientist, FOSS supporter (read more)
Tux Machines (TM)-specific
I recently purchased an External Drive Dock for work; this allows me to plug 2 SATA drives into my USB3 card, power on the dock, and mount (up to) two internal hard drives as if they were normal USB drives.
This Cavalry "Retriever" Series is the second Cavalry dock I've owned, the other being a perfectly-functioning USB2 dock. But while buying new hardware, we wanted to get the newest and fastest, so USB3 it was, in conjunction with this great USB3 card.
The USB3 Cavalry dock works perfectly in a USB2 port as well, and isn't any slower than it should be, meaning that there aren't any USB3/USB2 compatibility issues.