I have two disk grinders, and both use Rod's disk system......it's one of those things that once you use them, you won't know how you did without them! I used to waste tons of paper, because I would need another grit, but now I have "several" of Rod's face plates, and just pop one off, and another on when I need to change grits. The 1 degree bevel means you can grind those longer blades too!
I know Rod moved a while back, and not sure if he's got things set back up for production yet. That might explain why Wayne is out of them.