At first I thought the whole Power Zone concept to be plain stupid (double points when shooting from within the kitchen)....until I watched the Neil Robertson vs Shaun Murphy match.
In the last frame, there aren't enough points available on the table for Robertson to make a comeback, however by playing position to shoot all his shots from the Power Zone (much more difficult), he was able to manufacture an opportunity to win that match. High risk, high reward.
Usually a significant lead like that would have ruined the climax of the match, however the final frame proved to be quite entertaining because of the Power Zone.