If you look for them you will find a number of exhaustive threads on this issue here. Folks who swear by staining developers make very strong cases that their proper use is no more hazardous than D76. The question for me is why do you want to use such a developer. Are your photogrpahs lacking in a way that you think a staining developer will remedy?

I choose not to use chemicals that pose what I perceive to be a risk. I don't give a rat's rump about the counter arguments...staining developers will not make me a better photographer period!! Learning to see with greater sensitivity and the courage to take the photograph other's might not choose to take is a far more difficult and worthwhile path for me to pursue. I've concentrated on a particular, and generally successful set of procedures that tell me unequivocally whether or not I've made a worthwhile image. There are no magic bullets!