Love those terminals, was just thinking about looking for one!
I remember that the programmable MAC address feature occasionally came in handy when dealing with recalcitrant / braindead software ‘entitlement’ schemes vendors would occasionally require.
I absolutely adore the terminal. It appears to have several VT-compatible modes, so should be very usable with modern Linux. Except I don't have the accompanying Wyse keyboard with the appropriate setup keys required to switch compatibility modes. Gotta trawl ebay for one one of these days...