i have the areo ones, but the loss of contact is bearly notcable, its like 5-10 mm at the edge, it is probably to do with renault being cheap and instead of swapping the wipers about they put the extender on the "drivers side". if you sit in the passengers it perfect contacts all the way because that should be the drivers side, as its a french car, but because we sit in the right they had to put the swing extender in so it clears more water from our side and it just make the rubber of the blade move funny. but as has been said its not an issue.