How often do you replace them? Switched from WB last summer. Been about a year with the original brushes.
It all depends on how much you shoot. When it's time to change your brushes, which should be your bottom one more often then top ones. Its when you have a noticeble gap when your arrow is in your rest between your arrow and top brushes.
I had that rest one year and the brushes wore out on it I then looked for a replacement brushes and they were roughly around 4 bucks i believe so I ended up buying a schaffer rest and i love that much more...But when its time to change brushes you will know when you have to because the arrow will move around a ton