Hi, I wanted to know if anyone has tried both donic bluestorm z1 turbo and bluestorm PRO, the reason why I am interested in them is the hardness of their sponge is 50° and if anyone has tried them both, what is the difference between these rubbers, which one is more stable and etc., I've tried bluestar A1 and it's perfect rubber for my forehand but too stiff for backhand and I don't really like rubber with 47.5° sponge either.
