Hi Jimmy,
I have just bought a Highway usb card from the company KDH-Datentechnik via Ebay. I'm having trouble getting the card to work however.
So the natural place to ask for is the manufacturer directly. I don't have the time to read mailing lists and newspages all the day. And in contrast to other manufacturers we give support also to customers buying our hardware second hand or on ebay

About the issue with busboards: you didn't mention what system configuration you have. All you say is "it doesn't work".
For tracing your problem we need some more information.
Regarding bus boards and other Zorro cards: yes, there are problems, especially with some revisions of a certain manufacturer. Zorro cards are another issue: some cards behave very strange with interrupts (ioblix, eg) by pulsing it instead of giving a level interrupt; some others do not store the full base address and may therefore be mapped to the same base address as other cards, while the Kickstart is thinking that everything is working fine.
To conclude: please send me as much information about your system (kind of Amiga, busboard, CPU board, other cards, operation system, ...) so we can give you support.
Thanks, Michael