MacBeth,I've been looking at one of those gizmos for awhile.
I was thinking it would indeed be useful for my Vintage Light Brigade Wilkinson Sword blades.
They are now expensive and I've just been putting my used ones in a special Scotch glass, half filled with mineral oil to arrest corrosion. I would definitely try to sharpen those again ( although they last a LONG time)
Mine really works well. I've been using it on my Kai's and Persona's and it works well.