I've assembled a few of the Surlys and test ridden them on very short rides when done. Our shop only special orders them at the moment, but they are catching on, and we don't get much snow at all. Deep down, I think everyone who's ever ridden a regular mountain bike on singletrack wants to take one out and see what it's like. I know I do. I see them occasionally on our local mountain bike trails. Based on my short test rides, I think the Pugsley might interest me the most, the Moonlander is a beast. I might change my mind if I took one off road. Another model that has our interest is the Krampus (and ECR), a 29er with semi-fat tires.

One thing I really like about Fat bikes is that they embrace the idea that there's no need for hard and fast rules in regard to what a bike should look like, what it can do/can't do, etc. It does amaze me how many variations are on the market now from more and more brands. And now, like most things in the bicycle world, if you're willing to spend the money, you can even shave the weight down to a reasonable level.