the rubber on these tires is too hard in cold weather to give you good grip. I'd go with a winter tire setup...much safer. It really isn't about just the traction to move forward (we mostly drive on bare pavement anyway) its more the ability to grip to stop. I once watched a show where the host gave the example of taking a hockey puck and skipping it bown a driveway and watching it go quite a distance. Then he suggested trying the same with sponge or similar soft rubber object with te same weight as the hockey puck. It pretty much stopped on a dime. That's the reality - stick or slide. I like stick myself.
2011 535i xDrive, Dark Graphite Metallic, Veneto Beige Dakota Leather, M Sport Package, 316, 322, 3AG, 5AD, 5AG, 5DL, 609, 620, 655, 677, 6FL delivered Christmas Eve '10, Mods - quad tips, 20% tint, JB4.