These things are now so sharp they can bring an edge profile back to a knife in five strokes without even needing lubrication (which is nice as water is a PITA when it causes corrosion between the steel bed and the plating.)

Every knife in your kitchen can be razor sharp in seconds and kept razor sharp whenever you need them to be. IMHO, far more useful than a single digi-vibro-knife.

Example product: Trend 300/1000 diamond sharpening kit.