I got a simple question. Aside from the fact that it is wireless, and that the shape is a bit different. is there an actual difference between the two controllers? From what i can see, the two controller have the same amount and more or less same buttons. Is there a need to upgrade the wii Pro Controller to the wii U Pro controller if you already have the old one? Are the analog sticks more sensitive, does the Z/ZR buttons work slightly different? Or is it more or less the same in an upgraded slicker tint?