Been watching some YouTubes on Paper Wheel Sharpening. Wheels aren't actually paper, but MDF instead. One wheel uses silicon carbide for sharpening, and other uses white buffing compound for final honing. Looking at commercial wheels, prices range from $35 to almost $100, which seems like a lot to pay for a couple pieces of MDF. Silicon carbide is cheap to buy, and for white compound, Tormek sharpening paste could be substituted, IMHO. Anybody have experience with these systems?