I don't listen to enough slam poetry to know the voice they're talking about. But I also can't talk about it without mentioning Shane Koyczan.
What would you like to say about Shane Koyczan? I have heard of him before. Anyways the way he does that poem is something I have heard before but with different word usage.
Just that he's great and everyone should listen to him (or perhaps I'm misunderstanding your question).