most seem to agree that this doesn't help the pull force much on later-model monsters (mine's an '03).
That is odd. I installed slave cyinders on several of my own post 03 Ducatis--and it made a difference in lever effort.
I have/had 30mm STM and motowheels slave cylinders on the 03 999S, 05 999R, 06 SC1000 and 07 1098. They all had an easier clutch pull after the install.
-M