I live on the prairies in Canada where the temps are averaging -25* Dec - March. We get lots of snow and lots of ice in town and on the highways. I bought the car in May and this was the first winter. I was nervous to use these tires as everyone here has winter tires due to our conditions. I was blown away by the traction and grip these tires have! I cant speak to what they would be like after, say 30000miles, but now they are great. I still most likely will purchase winter tires largely due to not wanting to ruin my good rims.
Overall I think they are great and I drive in some severe cold, snow, ice and slush 6 months of the year!