Interesting. I built an AR488 a while back (https://github.com/Twilight-Logic/AR488) and it worked alright for my needs. I'd be interested to see a comparison of the two projects.
Here a comparison from a user: https://github.com/xyphro/UsbGpib/discussions/47
Here a comparison from a user: https://github.com/xyphro/UsbGpib/discussions/47