IMO the biggest or maybe even the only thing they need to change is the convex joysticks. Not only do my thumbs slip off of them, but being convex they make the grip a certain way, and that grip wears away surprisingly fast, which then causes ur thumbs to slip off of them even easier. I love Sony and the PS brand, but I do think they need to change this somehow. Why do they do the convex? Does anyone know? I thought I heard that the convex grip was good for certain types of games, but I'm not sure. Anyone know?