I have an Elkay fireclay farmhouse sink and love it. It has no slope (straight sides) and the useable space is considerably greater than a traditional sloped sink. Mine is 33" though.

This thing is super tough, which is good because I'm a klutz! ;) I've dropped knives and pizza cutters blade down into the sink w/no chips, nicks or permanent damage (just a small silver mark that wiped away w/soap & water).

The only problem I've found w/it is that since it's not sloped, it does take a little more work to rinse things out of the sink. Otherwise, it's the best investment we made in our kitchen... after choosing all drawers for our bottom cabinets, that is. :)

We have a Whitehaus white fireclay 30 inch and like it. It is slightly sloped toward the offset drain. We have a grid so nothing hits on the bottom. We do not have a garbage disposal. In the few months we've had it only once did I notice some stains and used a bleach solution. They came right out.