I have 18" Blizzak's. I had been driving on my all seasons and then we got bombed with 8" in one day and my X sucked on the snow. Threw on the snows and what a difference. Great traction and braking. I drive a twisty road to the skill hill for 45 mins and never feel like I have an issue with the snow and ice when I have my snow tires on.

I did own a 2004 Passat 1.8T 4Motion and that car was QUITE good in the snow even with the all seasons.

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2007 328i Sport, Monaco Blue
2011 X35D - sold -Space Grey
2004 X5 4.4i - sold - Kalahari Beige
2001 X5 3.0i - sold - Pearl Beige
2006 325i Sport, Sonora Beige
2000 323i - sold - Sienna Red