Tartman...other than OG1, I've seen very few Columbia balls thrown in my area. However, I did see the U-turn PP at a recent tournament in Cleveland. Although he had a specialized drill (appeared like the pin was about 2" from his axis with a low down hole), it still had a suprisingly strong backend. The guy wasn't throwing it well and it appeared to be very forgiving. Great read when he tugged it and strong finish, even with the layout, when he missed right.
Seems like it would be a pretty strong ball for mediums.