My take on the ceramic hemps is that they do not sound harsh at all, but as they break in, to me, seem to enunciate the notes in a sweeter fashion then a paper cone might do. I was not able to get the hemps to sound shardy, or hurt my ears with high end applied.
It is a dark sounding speaker, but has a slightly different tone due to the hemp. It is hard to explain until you try one out. They sound outstanding with a Schmidt.
They should keep a Tele from sounding too shrill.