I've heard of it, but I don't really have a place where I can practice growls and shit much. I usually just practice by growling while playing guitar.
A ringing fucking endorsement there.
Anyhow, I don't really want to sound like that style. The old school death metal vocalists learned to growl by just experimenting and going with it till they found something that worked; they maybe fucked up their voices a little bit, but most of them sound pretty normal. So that's what I plan on doing. It's working, more or less.