Drove my FRS in deep snow for the first time today! Still had 6 inches on some parts of sub, turned on snow setting just to see how it did and it worked great, I don't think I really even needed it. Had to plow through some sections... but didn't feel like I was getting stuck when I stopped and had to move over for suvs coming from the other direction a few times into unplowed areas. Only slid a little in a turn around getting out and had great traction with used winter tires
I think they have one winter left in them with 7/32 of tread left.