Best to get one on a try-before-you-buy basis
We had some appalling experiences with these at work. Whether it works or not seems to depend on the device, the adapter and the USB controller to which you're connecting.
We gave up and simply sourced USB devices.
I assume, of course, you're talking about the things that let you plug PS/2 devices (i.e. mice and keyboards) into USB ports.
The other ones, that get shipped with most USB mice and let you plug your USB mouse into a PS/2 slot, work much, much better.
Peter
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