Do electric knife sharpeners really work? Do electric knife sharpeners really work? This is a question we get frequently. The answer is yes, they have come a long way from the days when electric sharpeners de-tempered blade edges and subsequently ruined knives. I have a Chef’s Choice 120 electric sharpener and it is one of the best sharpeners I have used. It is quick and easy and as long as you follow the directions it sharpens knives flawlessly. The 120 gets my highest recommendation for home cooks.