Derick's sorta right. I would not say these tires are "horrid" in the snow, despite what tirerack rates them at. Though, they are not snow tires by any means either. I drove on potenza's in my 626 last winter and was just fine. I was able to slide around all I wanted, and control it very well, and when there was traffic, and other such obsicals, I had traction enough to stay put.
Don't know that the same expirience would be had on a heavy, RWD Mustaing in the snow, but they're pretty good all around tires, nothing spectacular. I mean, they're all-seasons, after all.
as far as what 'decent' means, I just checked the tread depths of them, and two are at 4/32 and two are at 6/32. They're used tires, taking up space in my livving room ATM. $50 obo. Just wanna have them out of my way.