The IIvx sure is an odd duck. I had one, still have the case as the case is mint. Logic Board flat out died long ago, and taking bad advice I tried washing it. It will probably never live again. :-/

When it did work, it was slow. Not as slow as an LCII/I but pretty bad. Apple could have had a winner on their hands if they did not cripple the bus.  Expandable, decent CPU, solid case and a CD ROM drive.