LFF has a good treatise on the usage of this stuff. Very good pictoral results can be obtained. The developer choices are discussed ad nauseum, with pyro and Rodinal being the top 2 choices. The Rodinal boys put up quite a flak. The pyro boys definitely have the logical advantage in their staining argument. I use Beutler's because it's easy, cheap, and works well enough to steal 10 zones out of a narrow corridor.