IMHO, this really is not a useful break. Here's my reasoning. There are three balls on a 9 ball break that you can predict paths for: the CB, the 1 ball, and the corner ball. If you make the 1 on the break, that means you need to have shape on the lowest ball to continue to run out. Well, that means you're relying heavily on luck, since you never know where that lowest numbered ball is going to be. As seen by my diagram on the previous page, it is possible to control the 1 ball to the point where it heads toward that side pocket. If you can consistently get the 1 ball to MISS the side pocket and head toward the corner (but not drop it), you can control the lowest numbered ball on the table, and thus increase run-outs. I think the perfect break spreads the rack, keeps the CB in the middle of the table, pockets a corner ball, and moves the 1 ball to the corner where you broke from. If you can consistently drop the corner ball, consistently keep the CB in the middle of the table, and consistently have a shot on the 1 ball, you should be able to maintain control of the table throughout the match.
In this diagram, point A is where the CB should end up, point B is where the 1 should end up, and C is where the 2 ball should go. This should leave a good shot for the 1 ball. You may need to move the CB around the headstring to find the proper place to achieve this break - it isn't always along the side rail.
