I just bought myself a X-3 Super a few days ago and this is what I measured when it came of the crate:
The runout of the spindle is .0003"
As for pushing and pulling the drawbar, I get:
Pushing + .002"
Pulling - .002"
The head was in it's highest position. The mill itself wasnot mounted on a surface.
It is likely that I will get different results when I mount it to a table, that would allow my to push/pull harder without tipping it over.