Mauribrew wheat yeast isn't stocked by many places, I reckon that's cos it doesn't really make a wheat beer in the way people want them, apparently. It's a one-off, bit of a mystery, unknown origin. I didn't like it at first, first taste was like WTF?! I did an American Pale Ale with it, eventually decided I liked it after a few months in the bottle. But I think it suited the darkness of Black Sabbath much more. Makes a unique stout. I read about a home brewed mild made with MB Weiss yeast, the guy loved it. I feel it works well with roasted malts, not necessarily the darkest roasted malts, I think it'll work with dark crystal, brown malt etc.