I don't like writing negative reviews, and I really, really, wanted - needed - this to work but sadly, it just didn't.
Just in case there's a newer model or something, the exact unit I had was model ST0014U-C, copyright 2016 on the box.
It worked fine for reading from a hard drive, but extended attempts to write to the drive - two different ones that worked fine in other environments - resulted in errors.
The dock would disconnect from my Windows 10 laptop randomly, and the activity light would just flash non-stop, requiring me to power-cycle the dock to get it to recognize in Windows again.
I had hoped that this was just a lemon, but searching online resulted in many other users encountering the same problem.
Yes, I tried multiple different drives.
Yes, I tried only connecting one drive.
Yes, I tried both ports.
Yes, my laptop was plugged in with power-saving off.
Yes, I tried multiple USB ports.
Yes, I tried different software.
Yes, I checked Thermaltake's site for a firmware update.
Yet all had the same result. It would run fine for a few hours with constant writes, then it would suddenly fall off the bus and fail.
I'm not sure if it's just an issue with the Jmicron controller the dock uses or what, but it just didn't work reliably.
I have other Thermaltake products (cases, power supplies, CPU coolers) and they are great, but this dock was a disappointing dud for me.
Others online noted the single-drive BlacX non-Duet version didn't have the same problem, but I was on a deadline and couldn't chance if having the same problem. So I ended up returning the BlacX Duet and buying an Insignia USB 3.0 3.5-inch drive enclosure and that worked fine using the same drives and operations that failed on the BlacX Duet.