We already possess these Faber-Castell-Spitzer now for some time. It was intended for thick crayons of my children, he sharpens also impeccable. After some time the use of the plastic collection container sits far too easy on the black Spitzer holder, so that the entire Spitzer falls apart when opened. The carpet is then covered with crayon shavings.
We own (no longer explainable reasons I) even two of these sharpeners. Both pencil sharpeners have the same problem, so I'm guessing a fundamental design problem.
So I had to sort out this Spitzer again. A smooth bad buy.