配合bettertouchtool
功能挺多，用起来很顺手。很安静，因为可以设置tap to click
网页滚动很顺滑。Logitech VX的很滑的模式很难用。
我的其他手势：
three finger click: middle click
three finger down: dashboard
three finger up: desktop
four finger click: spaces
two finger up: command+W
two finger down: command+T
