Opportunity is missed by most people because it is dressed in overalls and looks like work. - Thomas Edison
I'd really like one just to accurately "hone" blades. I don't see a point in actually spending the time sharpening up a super dull blade, just mark the bad edge, rotate, replace, whatever. But I would like to polish up just to know all our blades are nice and crisp at all times, it can make a hell of a difference.