Are ceramic speaker drivers a good thing?

Accuton drivers have been around for decades,

Kharma was one of the forerunners but now no longer use them in their top line.

However, I think they still use them in their lower line.

Looking at a new speaker, I am interested in the Kharma Ceramic 3.2.2 (although I believe this is an older model).

Years ago, I heard the 3.2.2s at CES in a room run be Steve Hoffman. It was the best room I heard at that show.

Lumin White is another line that still uses Accuton ceramic drivers,

And I think there are others. Are those drivers very accurate and fast? Or do they sound hard or shrill? Of course, implementation is key.
Any experience with the 3.2.2 or others with ceramics?