The principle is one of those tools that because of its simplicity it can be applied in very creative ways to many different things which allows you to focus on the patter, comedy, intensity, (whatever your style) rather than worrying about if the trick is going to impress. The effect is impressive by itself. Write some good jokes to go with it and viola! A solid routine for an opener, mid show, even a closer if you build it up the right way.
$8 well worth it.
Thank you, Cameron Francis