My wife drives a nissan versa 30 miles round trip to work. Typically when it snows she takes our Jeep. I found a decent set of snow tires (Continential) with 5k on them (9/32 of tread left) on them mounted and balanced on wheels that would fit our Versa on craigslist for $350. Since I would be driving the car in the snow I thought I would ask if the snow tires make a big differnce? The stock tires on the Versa now have just about 40k and are at 1/2 tread left. I know they won't make my Versa perform like the jeep but are they worth the investment?