Like others, I had to give this brush a shave to keep it from tilting the cases so much that they sometimes would catch in the die. Other than that, it does help to minimize case shake.
What was also a big help for me was to trim a bit off of the spring that applies pressure to the indent ball under the shellplate of my Dillon 1100 press. That made the shellplate stop at each station with just a bit less whomp. Between that trick and this brush, I don't have nearly the messy press I used to.
Check uTube for the spring trimming video. . . you should probably have a spare spring on hand in case you get too enthusiastic :).