Interesting thread. It sounds to me like there is a market out there for a class on how to use these sharpeners!
If they work for some people, and not for others, I have to think that there is a "knack" in using them which we ordinary souls don't know about!
We have a great kitchen knife sharpener in the kitchen. I wish I could sharpen my rotary blades on that. But saving them for paper work is a good idea!