I have been playing around with a few bench stones and Ive come to the conclusion that I really like the Spyderco bench hones. They are easy to clean when they get dirty, and most important they are very clean to use. No water no oil just open the box and bingo. I dont have an extra fine to compare to polishing stones, but I have a feeling it would work just as well as the medium and the fine. I use the medium the most and it is fast and clean to use. Ive been using it as a finishing hone. When I want a polished edge I use the fine and just a few strokes and done. For my coarse work Im sticking to the cheap black silicon carbide stones found at most hardware stores. For the step between coarse and the Spyderco I like the Shapton 1000 water stone. But most of the time if I dont need to reset the edge bevel I take off the cover and a few strokes on the Spyderco bench hones is all that is needed. Clean and fast what could be better.