I can't hold and angle at all really so I need some type of guided sharpening system. One of the issues I have is I want to be able to do both flat grinds and convex. I know the KME is capable of both I don't know about some of its more direct alternatives. I also like the idea and simplicity of a belt system ie the Ken Onion Worksharp but it from my understanding will convex most any edge I don't know if the blade grinding attachment changes that. I also have some concerns about a belt system heating up the blade and/or wearing off more metal than desired which seems less likely with a guided stone on a rod system like the KME. I am not locked into those 2 options but those are the two I have looked into the most.