I love winter riding. The past several years, I just put in some Kold Kutter screws. They work ok, but the rear tire wears down after about 5-6 rides. I ride singletrack/doubletrack trails, but there is always frozen puddles and frozen ground. It can be hard on screws when there is little snow. This year, I decided to make the investment and got some "real" tires (with carbide studs).
Here is my new rear Trelleborg that I just mounted up the other day.
Here is my front tire. It is a Chen Shen with carbide studs. It was custom done and I bought it "used" from a friend. Still has lots of life left!
I'm excited about trying them out. We just got a bunch of snow today. Hopefully, I get to ride this weekend.