TomD
My problem with stones is that it seems as though every three months there is a new theory. They all work. I am less convinced progress is linear. Or that there is any real way to prove it.

And of course, if you want speed, you just move to power. I just stick with stones for some stuff, because I have these Japanese legacy tools where sharpening with power is like drinking a fine wine with a straw, or out of a Camelback.