Door-Stop vs Rockdoor

Over the past couple of years, Door-Stop and Rockdoor have become the two main brands that customers have come to see as representing composite doors the best. So much so that they ask for them by name, something which you don't usually associate with the double glazing industry. But that is from a customer's point of view. I want to know what installers think of these two market leaders. Who they think is best? Who has the best product? Who provides the best customer service? If they think they're cheap or too expensive?