They are half price, and appear to have a pretty soft rubber on the middle. According to the guys who fitted them at Rent4Ring, the sides are stiff as racing slicks, they really struggled with them, but that also means that the tire are a bit heavier than R888, which is quite logical and I was expecting it.
They´re not as noisy as I was expecting though, especially given the fact that in some areas, there is absolutely no tread so they sound like slicks... On a very slick tarmac, it´s very noisy I have to admit, but the car will be less and less a daily driver ...
Last thing, they are very badly balanced. One of the wheels, the guys had to put 120gr of weights to balance the whole wheel!