I've got to give a thumbs down to the Firestone Winterforce. They came in 11th out of 12 winter/snow truck tires tested by Consumer Reports this year.
I had studded Winterforce's on my truck for four or five seasons before my studded Hakka's. The Hakka's are so much better there is no comparison.
A closer comparison is with the X-ice 2's we have on our SUV. Even without studs, I think the X-ices are better than the Winterforce's in every condition except for the deepest snow. Forget the winter performance, the worst part of the Winterforce's was their horrendous dry road handling. It's amazing how far tire technology has come since the Winterforce was designed, probably sometime in the last century.
Here's a better option. The General Grabber Arctic really stands out in Consumer Reports ratings for an inexpensive winter tire. It came in 4th without studs, and it can be studded.