I'm suprised that someone hasn't got on here yet ranting about how "4x4 will only get you stuck worse than if you didn't have it."
Well they are capable of that given the right driver.
No but stopping on ice/packed snow is the great equalizer, just because you can get up and go quicker than I can doesn't mean anything. Because when you try to stop we're all equal. . .
That's why I believe in chains.