Just got back from one in Dorset. This is the first time I've been to this kind of event.
It fell into an odd sort of category. There was a lot going on, lots of demos of crafts at the various trade stands and (importantly) loads going on for kids.
I found myself more attracted to the crafts side of the event than the actual "living off the land"/rough camping aspect.
There were an awful lot of people who could have been failed auditioners for the part of Mike from "Spaced", but the general atmosphere was very laid back and friendly, despite knives (or perhaps because of!!!), everywhere, on everyone from about the age of 6 upwards!
The kids both took a class in responsible knife handling, for which they got very nice enamelled badges and the right to carry their knives wherever they wanted on the site.
I have an irresistible urge to carve a spoon...