I,m one!!!
it gives excellent acess to the places you think "ooh it would be nice to stay round here" but cant find a commercial site,
the little nooks and cranny type farm yards and orchards etc are usually limited to 5 units (vans) but tend to be un limited for tents
we stayed in a field next to a massive commercial site (and got use of the facitiltes) in cornwall ans paid a 10th of the price for an extra 100 yards to the loo's
never come across any snobs though,...the opposite in fact,...
your normally thrust a cuppa within minutes of getting the tent out the car,...(and an offer of help)
cant reccomend it more,....
even if its for the "big sites book" which lists every associated place in the UK....
cheers
Stu