That move is sensational. As the fullback you either go under the posts untouched or get cut in half. I scored a bundle of tries with that one, the key was starting from outside the 13 and running an arc so you end up hitting the line more or less straight. You really need a 10 who can throw the blind pass in front of the 13 well.
I played for a team once where we only had one 'strike' backline move, but it had 4 variations. So each time everyone was in the same positions and nobody knew who was getting it until the pass was delivered. It was 10/12 cut (or dummy), blindside winger inside the 10 if the cut was dummied, 13 on the short ball if the winger was dummied, and 15 behind the 13 if the 13 was dummied. It was pretty sweet as we only had to learn the timing for one set and it used to bamboozle teams as we just did the same thing over and over again.