I've never ridden a fat bike, never even seen one in the flesh, but I do like the idea of them and would consider getting one based on the following assumptions:
They aren't as hard to pedal as I imagine them to be (fat soft tyres must be relatively hard on the legs no?)
They really are as much fun as everyone says they are.
They are as good through soft mud as they are on sand/snow (very little in the way of sand, snow or rocks where I ride, but plenty of soft, sloppy, slippery mud and puddles.)
Anyone with any experience able to confirm/deny my assumptions?
As much as I like the look/thought of one I won't get one if it isn't right for the job.