I was looking for an easy to use sharpener to maintain the cutting edge of a new kitchen knife and rekindle that of dull knives. I decided for this utensil after reading praises.
Result, a year later, the dull knives are always the same, the new knife has lost its luster.
In addition, if the small size of the widget does not really bother me, its asymmetry makes it difficult for left-handed use.