They work extremely well, but if you are sharpening triple laminated heads like Zwickeys, Magnus, etc., you need to remove the excess steel from the front 1/3 of the head while still keeping the appropriate bevel before putting them on the stones. Otherwise, the thicker front part (point) of the head will not be sharpened at the same rate as the rest of the blade. You can do that with a hand file or the Tru-angle block with two files. Follow the progression that Felix suggests, and you'll do fine.