So, I’ve seen these discussed here, but never handled one until this week. At a kitchen store in Vancouver, a helpful man demonstrated one (brand already forgotten, but $$). It had at least 5 fixed sharpening angles, and held the demo blades very securely.
I like the concept a lot for holding the angle. And the small abrasive face stays constant relative to that angle. With a curved edge, it’s not perfectly the same, but it’s better than us mere mortals can maintain by hand and eye.
And then… I paid closer attention the the interchangeable abrasive faces. There were either 4 or 5 of them of different grits. As befitted the price, they were diamond-coated. And as befitted the demo, they were still… worn. When I asked the man about replacement faces, he confessed they didn’t carry them.
This may be the Achilles Heel of this method.
Anyone used these rollers for long or replaced the faces?
