(from an independent dealer, despite everyone on OCUK saying they're always a rip off)
They are not a 'rip off' in terms of price - often they lead on price as they can hardly compete with glass palaces - but if you are unlucky to get anything wrong with the car it can be a struggle and you don't get the benefit of speaking tot he previous owner and understanding the history of the car.
It is of course entirely possible to get a good car through such a dealer, as you have.
But feel free to continue to misrepresent the point people often make
