I've read multiple reviews saying the chefs choice sharpeners are basically useless. Having owned 2 of them I can confirm they seem to do almost nothing after the first few times using them.

A few YT knife channels have done deep dives showing why they stop working soon after purchase, the details escape me but I have to agree with the end result....

Can confirm, they're useless. Just pay someone $10 to sharpen the knife once in a while.