I have these tyres on my Renault Clio TCe 90 as OEM factory fitted tyres. During the first 4-6 months, they were 'ok' but soon after, these tyres became the most uncomfortable, rigid, noisy bumpy tyres I've had. And this is a situation of history repeating itself. Had the EcoContact 3 on my previous Renault Twingo and same thing happened. They are so uncomfortable, so unsettling, so rough and noisy that you will not believe that all this is coming from the tyres. Once, I had a bearing hum noise coming from the rear and I was 100% sure that it was the rear bearing since it had all the properties of a defected bearing (increase with speed, more on turns etc..) Went to my mechanic, almost ready to buy the wheel bearing when all of a sudden, he told me that surely it's not a bearing since the wheel free rotation was perfect. Changed the tyre with the spare wheel and the noise vanished! Incredible! Replaced my front tyres with brand new Goodyear Duragrip (which are relatively cheap to buy) and was astonished with the EXCELLENT comfort, grip, quietness and precision! And they lasted with such good characteristics for, at least 5 years!
On my new Clio, 1 year on, exactly the same problems. Will be replacing them with Goodyear EfficientGrip Performance in the coming future. Continental are disastrous. I can't understand why Renault have been fitting them as OEM tyres for all these years!