They're often called Luxury Shafts by those in the Duratec forum too.
We gave ditching them the fond "BS Delete" name because having them in there is really B.S.
They balance out NVH (noise, vibration, harshness) transmitted from the engine to the car. They aren't intended to actually balance any of the engine internals which is what some have been led to believe. They simply aren't necessary if you can tolerate some minor additional vibrations at idle.
I have removed the balance shafts on my Duratec already, and have the VF lower mount installed so far. The only time I notice the added vibration is when I am idling with the A/C on and it's hardly worth mentioning or complaining about. I'll add the other two mounts when the 3rd one becomes available.