Chiming in from Buffalo NY where every winter is a nightmare...
I am in my second winter with my DTS. It handles well on snowy roads as long as I have nice fresh tires on it. The first winter I drove the first half with the tires that were on the car when I bought it, and it was a nightmare. They were decent tires for the summer but they did not get me around in the snow, I had to find creative ways around in the hilly country area where I live and work, as the car refused to climb hills at all if the roads were slick. Then I had Tiger Paw tires put on an they were great. This winter I took the car to a different dealership (because the one I had been going to was fairly incompetent and couldn't successfully solve some mechanical issues) and they didn't carry Tiger Paw so I went with some Firestones and they're OK but not as good in the snow. I think the new dealership was focusing on maintaining the Cadillac ride, whereas the first one that sold me the Tiger Paws was more concerned about me being able to drive in snow while sacrificing some of the quiet ride aspects.
Personally, I want to have a set of snow tires mounted to basic steel rims for winter and have a decent set of all season tires on the Cadillac rims for fair weather.
Watch that ice/snow doesn't collect in your rims, I find that driving through heavy snow and slush tends to deposit snow in the rims and then sets off the balance real bad.
The cars weight certainly helps it, and while FWD Cadillacs have their detractors, I've driven large RWD cars in bad weather and it's no picnic, so I'm happy with my FWD DTS, now if only they could successfully pinpoint why my check engine light won't stay off id be in business!
Stay warm out there, and pray for spring! I'm beyond ready for warmer weather, no snow, and a trip to the detailer to clean out all the winter grime from in and outside my car
