I have been using the Stiga Cybershape Carbon for a little while now pairing it with a slow and medium speed level with the National Hurricane 3 Neo on forehand and Tenergy 80 on the backhand. The hardness of the Cybershape help boost the speed of the Hurricane by a bit and is holding pretty well. The only draw back I found was how heavy the head was and the CWT did its job and helped a lot.