OK, here’s my impression:
Comes nicely packed, easy to assemble. Instructions are easy to follow, except they don’t really tell you how to clamp the knife in the holder, but eventually you see a thumb screw and figure it out.
I chose a 20deg. angle and started with the medium abrasive, 600 level, and worked the rod with the stone up and down over the edge while slowly working my way across. The boning knife was somewhat sharp to begin with, but I could feel, and eventually see, it cutting a new edge.
They say you should be able to feel a burr on the other side, but I never did. After flipping it over and doing the other side, I switched to the honing (ceramic) stone, and continued again with both sides.
The knife feels considerably sharper, and was able to slice easily through a piece of paper with almost no pressure.
I think I spent less than 15 minutes total using both stones.
Opinion: I like it and will work my way through my kitchen knives with it, doing one or two a day.
Edit: I told my wife I was going to sharpen all the the knives and I was given a cease and desist order not to touch her favorite knife, a 6” Wusthof chef’s knife, “it’s sharp enough”. Explanation about how it would be better was futile. So I’m going to be sharpening almost all our knives.
Further edit: Picked it up again, did three more knives, gets faster each time. Did one very dull paring knife, started with coarsest stone, 320 grit, and got the burr on the other side as mentioned in the instructions. Did the other 2 grits, knife is like a razor.