Last year in Minnesota The Bike Hub Coop had a Pugsley bike demo out at Lake Phalen around the time of the winter carnival. And I think they might still stock some - you could try it out yourself this winter.

I did go to it, and learned a couple things -
1. Comfy - Those big fat tires really do feel exactly the same as suspension
2. Really nice on show - The big fat tires really did seem really nicely on snow - to bad I didn't bring my mountain bike so I could have done a back-to-back comparison. :-)
3. Still no grip on ice - Those big fat tires still slip out from under you on sheer ice, perhaps a bit slower but just like any purely rubber tire will do.

What tires are you using right now? Because of #3, I don't recommend a Pugsley for doing anything in winter other than toying around - unless you want to make your own, nobody sells a studded version of the puglsey sized tire. :-(