hi, just bought a macbook. on pc i use logitech trackball mouse. (as normal mice hurt my wrist) apple dont make a trackball mouse do they? and ive never understood wireless mice. they take batteries. so say if on christmas day the battery runs out. shops are closed. so you cant use your mouse? wire is more reliable. so all you trackball mouse users........which one is best for you? is macbook laptop trackpad good for wrist? or does it promote RSI?? ? thanks.