Well, the snows on my truck are near full tread but pushing 4 years old. I think they'll be ok. Snows for wife's car are shot, the good half is gone and the remaining half are loud. Real question is, do I bother with cheap snows for my car... considering we both stay home when it snows. Only two drivers so three cars with snows is a bit overkill.
Plus it's fun doing doughnuts on all seasons. I think that's what the purpose of the handbrake is for, after all it's the only thing I use it for.