I've used about 5 sets of ebc green stuff pads before and the only problem I've had was with one set getting crazed and starting to crack up but this was after being left standing a while over a winter.
Not on the clio but a 1000kg alfa 145 used mainly on track.
But having said that I had to replace a set of yellow stuff pads on a mates Volvo T5R last month as one pad had broke up and come away from the backing, they were old though, I'd recommend them.