Depends on what your expectations are. I've got one and wouldn't buy again. I bought when the only game in town was the Pugsley and they were very expensive.
I was expecting an ATV, go anywhere bike. Turns out, it won't handle more than 2-3 inches of fresh snow. Around here we get a lot of freeze thaw cycles so you just get a nice layer of snow, a day or 2 later everything melts a bit and then freezes and you get this churned up frozen mess that you can't ride on.
They don't handle ice any better than a normal bike and studded tires are $200-$300 each. You need excellent bike handling skills as you end up riding on a trail in the snow about 8 inches wide.
They are deadly heavy and slow rolling under normal conditions.
One guy I talked to had 29er wheels built for his for summer riding - a great idea but the custom wheels would cost almost as much as a second bike.
I've had more fun with my snowshoes and Altai skis.
