over the years of sharpening knives, i have had guys bring me knives they sharpened using different stones, contraptions and devices, they even brought me some of the contraptions to check out.
i used to work at a company that made aircraft lights and they had a buffing department that would be the envy of many knifemakers. these guys could put a pretty impressive edge on a knife in no time. i seen some of these guys after i bought my wheels and they liked the edge the wheels put on a lot better than what they could do.
i have super fine diamond discs that i have put on my dremel tool and experimented with sharpening tool steel test blades i made.
i have ceramic sticks that i still use on kitchen knives to touch them up if i'm in the middle of cutting up some food.
on my ez sharp i had a pure white fine stone that was smooth as glass that i could polish up an edge with.
i tried a 9 micron belt just to see what it would do. out of everything i have seen or tried, nothing else i have seen or used can compare to the edge i get with the wheels.