I'm not sure the ultrafine rods are necessary. You can get a knife shaving-sharp using the medium rods alone, with practice (just did this myself yesterday...finally).
I think at a certain point there's a difference between having a knife that's plenty sharp enough and having Obsessive Compulsive Disorder.
I think at a certain point there's a difference between having a knife that's plenty sharp enough and having Obsessive Compulsive Disorder.