The tires make a HUGE difference... my SVT hasn't had any all seasons on it since I got it, only Z and 2 sets of W rated summer tires.
The Kumho 712s (Z) and Cooper 2XS (W) SUCK horribly in the snow. I got stuck all over the place in Montana with the Kumhos last winter, then the Coopers at the start of this winter couldn't get me up a packed snow continental divide pass in Wyoming, while my dad's Cadillac didn't even slip a tire.
Now the Dunlop SP9000s (W) on it now, I have yet to get stuck in the blizzard we just had last week (and I tried...).
