I had my Dunlop M3's removed this past weekend, and the Pirelli all-season's put back on. (Because I'm trading it in on a 335i).

What a difference! The snowtires really were good. Now the all-season's seem like junk in comparison. The X3 is now tail-happy on snow, and is a little scary.

I will miss the traction. If you don't have snow tires on your X3, you don't know how good it can be!