Personally, I think Bills drums and cymbals sounds from those days are classic. They fit Sabbaths, heavy, low, and muffled sound just right. Bill didnt use tape or muffling on his drums or cymbals. As bongodoggie said, it was a basic Buddy Rich style kit. Bills drums dont sound like Buddy.... why? Watch him play. He plays with the butt end of his sticks and seems to digs into the heads. Unorthodox? yes. But for Sabbath, nothing else would have fit the music. He hasn't really played drums in any other group since Sabbath, he says it doesnt feel right playing drums without them. Maybe he doesnt feel like his playing would work in other bands? I dont know. I'd would love to see him doing something with music nowadays. He seems to have slipped off the map.