This gives me a chance to ask a related question ...

There is a YouTube video maker that I enjoy called "Project Farm" that did a video comparing knife sharpeners.

https://youtu.be/uEDyYJJ6f9M

It included the Spiderco Sharpmaker, which I've used for many years, and it rated well for its sharpening capability, BUT the video goes on to stroke the sharpened knives on hardwood, and then measuring the sharpness, and the Sharpmaker sharpened knife failed pretty miserably.

Why would that one sharpener cause a knife to dull so badly? He used the same model of knife for all testing. New, dull it, sharpen it, test sharpness, hardwood, test sharpness. I couldn't tell if he only used one knife per sharpener (sample size = 1). If so, I tend to wonder if he had a bad blade.

Any feedback on this??

BTW, the Lansky with the angle rods and four different grits was found to be excellent for the price.