I have heard that they don't work at all. I think the reason was it basically shreds the husks up and gives you more of a flour crush. These two things combined can give you a stuck sparge because the intact husk is what forms a natural filter bed, and the flour will turn into dough.
But hey, you've got the mill so you can make flour for bread.
So my take on it is, don't use it unless you want to see if it will work but I doubt it will. You may possibly have to modify it if you really want it to work (if you indeed can).