Well I can confirm that with today's dump of snow over the south Birmingham area, my XC60 with Nokian Weatherproofs on has performed unbelievably - it's like you're driving in normal conditions.......so smooth, not a hint of the car being unstable at any point - passing stranded vehicles all over the place.
I live half way up a hill that in my previous cars I wouldn't have got back up this morning.
Sailed up it and into our drive.