@jschwart@mas.to Yes, some revisions fixed a bunch of issues. Also these were part of the first generation optical mice in the year 2000. I can't think of any mice that were better than the IntelliMouse at this point in time.
@SuperDicq we had these mice in university. They were horrible as they were sending phantom clicks all the time. At one point we ran xev and just lifting up the device already showed it was sending button presses. We often had compilation errors because the mouse had been randomly pasting stuff from the clipboard (through middle clicks). As all these mice had such issues we ended up disabling their buttons when needed to do coding.
I presume some revisions of these mice didn't have that problem