ceramic is harder than steel. They are made so the spherical shape is much rounder than steel. This mean less wear and maintenance if you use dust covers and use very little lubrication in the differential. One of the key things to the diff action is to make sure the press steel rings are sanded flat on both sides to promote even pressure across the rings and on the balls. This means that the diffrential doesn't need to be tightened as much and the groove wears evenly into the ring making the diff smooth and low wearing. But remeber to use enough black graease on the small thrust bearing and keep it clean as this is what usally causes the diff to feel gritty.
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