Thanks,
I have one of each of the above and apart from the writing on the back I could not for the life of me find any difference....so now I know, there isn't any. On another issue, One of the track balls is starting to get a bit scratchy, I have removed the whole assembly, cleaned, and replaced it but I reckon its had its day. Looking on the net(ebay) I can only find trackball assemblies for VX2. Are the Navnet (1) and VX2 assemblies the same? Is any software involved in a replacement.
Cheers & congratulations on the site.