Acceleration is the key, how often do you see players running them in from way out. Dallin Watene-Zelezniak try was down to acceleration, a little in and away and gas it to the corner. Any further and he was caught.
It is why I bang on about the passing, players should be bursting onto the ball, accelerating as they take it.
The oppertunity to go the length are few and far between in a match, however it must be nice for some teams to have that in their armoury knowing if they can present a certain player with clear field in front of him its all over rover ala the fox.