From what I've seen it handles extremely good in the winter time. As long as you don't drive like an idiot the car remains very manageable even in the worst conditions. It also helps to have the proper set of tires for the right occasion.
Since it seems like a couple of you guys here have experience with the Porsche Cayenne and winter driving them, what winter tire did Porsche give you guys? Or did you end up going to a shop for your winter tires?
If I get a Cayenne it will be my daily driver, 365 days of the year so I want to make sure I'm safe and nothing loosing control of my Cayenne in the winter.