The weather is still quite a bit warmer here in Chicago; a balmy 28F this morning, so I'm still on the summer bike, and haven't had a chance to use my really cold weather gear.

I use my Schwinn KOM in the winter with studded tires (which I think is the same frame as your paramounts). I tried a buddy's fatbike last winter and decided that it didn't handle any better than my current bike on plowed streets, worse on ice and much slower on pavement. The advantage I saw was in snow over a couple of inches, which is infrequent enough that I can't justify a whole bike just for that. I hope you enjoy yours. Keep us posted on how it works out as a commuter.