I have used the sharpener for years. I find they are not as sharp and need to be sharpened sooner than a new blade, but it saves $$. I have already purchsed replacement disc for sharpener. I keep one of the little plastic containers marked to sharpen for free(?) time. My husband has been known to sharpen while watching TV, either he does it onger or presses harder but does a better job. I tried to mark sharpened ones with magic marker and foound that the blade stuck and almost had to throw cutter away. I have oiled for years but have put on too much and had drips so run over scraps first or carefully wipe down.