The Duelers were on my Highlander when I bought it in March. When one tire was punctured by a screw during the summer, I considered replacing the entire set due to the very poor reviews for winter handling, but decided to wait until I could actually test its performance in snow.
This morning (late December)we had rain, turning to light snow. I took the Highlander out onto level streets with only a quarter inch of snow on top of wet/icy pavement. The handling was scarily bad. Even at 10, 15 and 20 mph, the SUV would continue sledding straight ahead for when I braked. I did not feel safe driving over 25 mph even in light snow with these tires, which is unacceptable in this part of Michigan.
I immediately ordered a set of Michelin Latitudes Tour's. I hate spending $1000 on new tires with less than 10,000 miles on the original set, but I feel I am unreasonably risking wrecking a $40,000 vehicle this winter if I continue using the Duelers, which are definitely NOT All-Season tires.