Did you have a chance to try out the Duratrac's in varying snow conditions before the melt? I've been seriously considering them and the only thing holding me back is whether or not they'll be good enough in the snow/ice.
I currently run a set of Michelin Alpin's on a spare set of rims in the winter, but they're in need of replacement next year. If I just stick with a Duratrac all year I can justify the price of the tires as I won't have to buy a new winter set in 7 months.
I snowboard a ton, so even though the city streets get clear, I need a kickass winter tire.