I have one of these, they work good though modern mice with high DPI tend to overwhelm it (or the C64 a) if you move it to fast (the pointer sort of loops back on itself).
Another issue is that without modification of the 9pin connector it will not fit the A600 or the flat C128, those screw in things get in the way of the computer case ... I need to find an extension cable that doesn;t have the screw things.
Mark
