I have two of the hand held ones, and they are not any good. I have debated about the electric one, but they are so expensive.

All Great Information.

If you use one to sharpen a dull blade you wont' have much success. If you sharpen a sharp blade it will never get dull. Ever see men sit and whet their knives everyday? The knives were sharp before they started. Before every cutting session I run my blade through the vertical bade sharpener several times. And then several times during if I cut a lot. Unless I hit a pin or get a nick my blade lasts a long time.

I usually put the date on my blade when I put in a new one. The one I'm using now says 12/12/2017. I sharpen it before I use it every time. I expect the new Endurance blades to last me for years more. LOL

If you are asking about rotary blade sharpeners, I have yet to hear of any of them that work very well. I have found incredibly cheap blades online that are great. Sometimes one will not seem to last as long as I want, but when I am getting 20 for the price of 5 at the store - it is still a great deal!

Thanks everyone I appreciate all your inputs.