Has anyone tried the new Dunlop Biomimetic F5.0 Tour? I currently have the 4D 500. There are 2 things I'm not a big fan about the 4D 500 is the small sweetspot and the fact that the strings move so much because of the 16X18 pattern - though I love the spin, the strings just wear out or loose tension too quickly. Well it seems they corrected that on the new version so I would like to know what people think of it compared to previous versions. Does the different shape impact on how the racket feels? And how about the balance change?