I think we may have discussed this before, but in case that was someone else...

I could never get the ethernet daughter card to work with Open Transport. In fact, having the card installed when Open Transport is active locks up my computer. That was in a Mac IIci. I'll be interested to read if you have a different experience. Of course, if you stick purely to "Classic Networking" and eschew Open Transport, it won't come up.

I was using it with an E-Machines Futura IISX.