If you've got quite a big collection, like us, then an electric sharpener might just be a worthwhile investment.
There are two wheels inside the machine made of aluminium-oxide. There is a coarse wheel and a fine wheel. Both wheels have been loaded onto springs, so they react to the thickness of the blade being sharpened; therefore if you have a slender blade like a Filleting Knife, the wheels won't move as much as if you were sharpening a cleaver or a thicker chefs knife.
Knives will typically be sharpened in less than a minute and because they have an exact angle on both sides of the blade, edge retention is approximately 10 times longer than if you were using a manual, non-angle controlled method (like a butcher's steel rod); thus increasing the life of your knife!
