We started putting snow tires on our cars a few years ago and have been amazed at the difference in handling. (Which reminds me, I should make an appointment to have the tires on the Saturn swapped soon.)
We priced out snow tires for the Eos, though, and have decided (for this year, anyway) to park her this winter until roads are clear and dry. Winnipeg gets a fair number of those days, so it shouldn't be too bad, but we'll drive the Saturn during the worst days.