I have ignored the Sharp Maker for two reasons. Maybe I should reconsider.
First but almost as emphatic as my second is that many of my edges are well bellow 20° per side. I am obsessed with thin knives, think kitchen paring knives, and shallow angles. A whole lot of what I cut every day requires no more and the tactile experience of using these are too addicting to relinquish easily.
So
with the sharp maker I would be tilting my hand a fair amount, I imagine, so it is almost like being back to free hand guessing on a hand held stone.
OH, Oh, oh and I just thought of a third
HUGE REASON I have avoided the Sharp Maker and
it is a totally irrational one I'm sure. I have two sets of the ceramic rod sharpeners that you can find in any sporting goods store. One set I bought and the second set I found when I cleared out my parents stuff after they passed away. I just looked on the base . . . they are called Crock Sticks . . . theyre a CROCK alright !
Both of these generic ceramic rod sharpeners SUCK so bad they do absolutely nothing. Over the last twenty years and more I have come back to them thinking it was ME but no they are only good for . . . for . . . for . . . well I can't think of a single useful thing I could do with one of those ceramic rods.
So I was traumatized at an early age by ceramic rod sharpeners promising the world and delivering only disappointment and low self esteem. Why pray tell do they have little slots so I can see the stones when they are stored in the wood base ? Or was that just to make it easier to drill the storage holes and get the wood chips out ? If that were the case best to have used two slabs of wood routed like a pencil is made but I am getting off on a tangent.

And lastly, originally secondly,

I am phobic about sharpening AGAINST THE EDGE. From what I know of metal working, jewelry polishing, and actual experience sharpening woodworking scrapers which admittedly are softer cutting edge steel . . .
It is always better to move down the bevel and OFF the edge.
Why ? ? ?
Because it
BURNISHES the molecular structure of the steel into a sharper edge. Think pushing putty into a fine smooth edge by pushing it with your thumbs ever finer as opposed to trying to do the same by tapping on the putty, edge on, with a rock.
This, I believe, is part of the attraction of a "well broken in" translucent hard Arkansas stone. it pushes and burnishes the metal and not so much abrades it.
For instance in jewelry they use a hard polished stone to burnish out scratches rather than try to abrade the whole surface to remove a fine scratch.
So if I were to buy a Sharp Maker I am sure I would find my self . . . hahaha . . . woefully, hopelessly, unadvisedly I know . . . ATTEMPTING to sharpen on the rods by starting at the bottom of the rod next to the base and moving the edge up the stone to the top.
I couldn't help it . . . it is just how I intuit an edge should be produced. At lest on the final stone or two.
The one exception might be a toothy edge where the pro sharpener is moving diagonally in both directions to create finely formed and well thought out actual saw teeth on the edge.
How ever effective that might be in the real world I am not there. I am endeavoring to create edges as close to the sharpness of broken glass as I can get. Two mirror like surfaces coming together to create the "Worlds Sharpest Edge".
I realize Sal is a smart man and that his Sharp Maker is well made and not like the Crock sticks . . . I just can't let go of the ladder and swim across the deep end . . . yet.
Hey any body want to buy some fine, vintage, almost unused ceramic rod sharpeners ?
I can make you a deal if you buy two sets. One for a loved one, (or hated one). Any takers ?