I've actually found some things that I forgot I had! Most are small and thus easy to forget, but I've had this thing lying around for years. Since the face vise on my current bench is starting to rack, I'm sorely tempted to swap it for this. However, I've never used one of these one turn open/lock quick adjust vises so I have no idea how well they actually work in practice.
I'm pretty sure the next bench will end up with a criss-cross leg vise.