Actually very nice for devices like my 2011 iMac without USB 3.0 but with Thunderbolt, so we can plugin fast and cheap USB-C drives.
Not sure if it works that way.
Does it convert only thunderbolt 3, or both thunderbolt 3 and USB 3.1 to thunderbolt 1/2 Mac?
I currently use a dock on my 2011 iMac to get USB 3.0 ports (and daisy chain a ssd thunderbolt boot drive). I would love to simplify it and just use this one adapter with a USB 3 ssd.