The same manufacturer makes the belt drive system for Trek's Soho. There was an extensive thread on that bike in this forum. I think the main knock against the belt drive (from people that have used it) is a squeak that had affected some of the bikes. I don't know how common it is or what if any fix exists.

I think a belt drive bike would be great for winter but personally I don't care for the Aerostream. Only 3 speeds and too cruiser like for my tastes. Nothing wrong with cruisers, just not something I want to commute on. YMMV.