OP: If you don’t need it anymore, you probably can sell it.
I asked Walter at Underwood HiFi, the distributor for the USBe Perfect, if the directionality mattered. He said just try reversing it. Nothing will break. He was right.
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The USBe Perfect is a USB signal regenerator. It is not a filter or enhancer. Ozzy reviewed it here. Conceptually, it is similar to the Smoothlan Ethernet Regenerator.
Initially, I got my USBe Perfect to improve the SQ for streaming from my modded laptop. It made a substantial improvement. Less edgy, less grainy. But soon thereafter, I switched to a dedicated streamer - which was far superior to the laptop.
Out of curiosity, I installed the ’Perfect’ in the USB output from my streamer to my DDC. The SQ improved once again - but subtly. More refined, more natural, more spacious. Every once in a while - with all the improvements to my digital chain - I remove it - thinking I don’t need it anymore. I always put it back in. YMMV.