Ceramic knives can keep a sharp edge for a very long time and you won’t shed tears when cutting onions like you normally do when using a steel knife. This is because ceramic is chemically inert and the reaction is next to nil. However they are delicate.
They do break and attention needs to paid when using small blades for difficult tasks. This knife break was dangerous, and if you buy a ceramic pairing knife always make sure its not stressed too much or it can snap off – as this did.