A lot of posts on this, if you can find them through search. Some people love their fireclay sinks. Others report that they do chip, and contrary to what they believe, the inside material revealed by a chip is dark--these sinks are not the same color all the way through. Also be aware that with a fireclay sink, you need an installer who knows what he's doing; overtightening the flange can crack the sink.

I've never owned either, but I looked at a h ouse last week with a large, beautiful fireclay sink. The entire inside bottom had dark crazing marks like crackle tile or old pottery, and looked like it was a hundred years old. Perhaps it was originally installed incorrectly, or the owner had abused it; I don't know, and I didn't see a logo on it.