Having lived in Michigan's Upper Pennisula for longer than I wanted to (26 years), turning it off in deep snow is hit or miss. Turning it off is more on how your car "feels" under you. With experience, you can get yourself out of some tough situations, like going uphill in a manual on black ice. The trick with the deep snow is to know when to rock it and when to hit it with the traction control turned off. This is simply a matter of experience and you won't know how it behaves for you until you've done it a number of times in the specific vehicle and gotten yourself really stuck at least once. I recommend putting a bag of kitty litter and a child-size shovel in your trunk for the winter.