again, and as Dan said, good or bad, we adjust;
if we are clicking a meter (which unlike the tests) is moving and we have to click when it crosses a certain area and we find we are late we try to click an imaginary point before the meter, etc. etc.
It's a timing thing, nothing strange to gamers or musicians (esp. drummers) etc. who employ these techniques.
My nickle: don't replace a mouse that is working efficiently. Unless you want to.