I have both a Classic-3 arm and a complete Classic-1 armtube/arm assy. There is a real quantifiable difference between the two. I don't know if this correlates as to the/a difference between a 9 and a Classic 3 armtube/arm assembly. But the difference is real, now whether or not it's worth the money, that's a personal decision, but having hear the difference between the two it'd be a no-brainer for me to make the upgrade.
M~
M~