I have the new Tru Cut electric rotary blade sharpener.
It works fine. Except it doesn't take out the nicks.
It does extend the life of the blade as long as the blade just needs a touch of sharpening.
To the post that said after sharpening the blade there were still threads that had to be clipped. That means there is a nick in the blade and no sharpening will take it out.....
Toss the blade.