DParm is right on. For my climate (no snow, except maybe once a year, and trips to the mountains...), they are perfect, and I have the WR G2s on both the Volvo XC and the Mercedes 300E.
Good wear on the 300E, the XC eats tires, and they are holding up about as well as the Yokohama TRZs that preceded them.
Great grip in the snow/ice/slush, maybe a bit short of the Hakapelliittas and Blizzaks that I've previously owned, but much better than any other all season tire.
No adverse impact on economy, smooth ride, low noise - the best all season tire I've ever had...