The Australians don't usually do sauvignon blanc well. The climate is mostly too warm, there isn't a great demand for it outside of Australia, and the country's winemakers prefer to spend their time on big red wines.
So the Wine Curmudgeon expected very little from this -- and learned, once again, never to assume when it comes to wine. The Rosemount is wonderful $10 wine, an amazing accomplishment. It's clean and crisp, without any of the flabby character usually associated with warm climate sauvignon blanc.
It's more California in style than New Zealand, which means tropical flavors as opposed to the big grapefruit that New Zealand is know for. Served chilled, this is a porch sipper as well as an amiable companion for grilled chicken and shellfish (shrimp on the barbie, perhaps?)