I've had snows on both the Miata and the G35 since late November. We've seen but one minor snowfall and it makes you wonder if it is worthwhile.
We are heading to Florida through the mountains on I75 in a couple of weeks. There is always a tradeoff - a bit more noise and a little softer handling to gain the peace of mind on the highway if snow starts to fly. We have driven through the smokies in snowy conditions and we weren't worried about us losing control, but were thinking of the people in the SUV's because they think they are immune to the laws of physics.
We had a handful of SUV's in the ditch the last time.