Not for everyone, but with my short commute I rode the Minnesota 1.0 to work today.a little snow and a lot of ice, I wanted the big contact patch.

Let us for a minute define slow. If you have to go through any traffic lights at all and your commute is under 5 mi then there will be several days when your commute is more dependent on lights than your bike speed, at least it is for my 6-mi commute from my girlfriends house, through town and campus. My fastest time ever was on my steel city bike, 45lbs, because I got lucky with the lights. If a fat bike makes your commute more fun, go for it. If your carbon fiber aerobars 18 pounder makes your commute fun, go for it.

I looked up the spec on a bullseye monster, not bad for $500 if you wrench on your own and you are fat-curious. The first thing you will want to upgrade though are the tires. I have those tires, they suck on pavement and really are not that great on snow or sand. So think about that before you drop $500 and think you have a snow machine.