Have about 1000 miles on these now. First thing is that they make the steering much lighter, which worried me when I took delivery. However, the car corners at least as well as with the stockers-perhaps the slight increase in width is making up for the less sticky compound? That's at 45-90 miles an hour on real world sweepers, I don't autox. There's been one day of 2" of slushy snow, and the car, with the snow tires was quite disappointing. I couldn't break the tires loose at any kind of sane speed-comfortably passed the farm trucks that were plugging along at 40 with no drama! Hopefully with a bit deeper snow I'll have more fun, but from a safety point of view this car on these tires is a clear winner! 
