I had an X Zone High Diff recently--it was one of the balls that I practiced on when I got my drill press. It was laid out 5 x 5 with no XH, and it was probably a good three to five feet longer than my Fuze Igniter, but stronger in the back part of the lane. I liked the ball, but I seldom ran into a condition where I needed that much push in front.
I'd have to say that Brunswick was right in their advertisements when this ball came out--the X Zone High does seem to be better suited to those with more hand.
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...formerly "The Curse of Dusty," and "Poöter Boöf" before that...