Interesting article. It really didn't directly address one main question I had (how much does a changeup rely on its spin?), but it did show the impact at Coors. Change-ups have an average Coors effect increase on BA, but a much larger increase on SLG. So its the slider pitchers that will do the best in Colorado. I actually don't mind our pitchers developing there. I think it makes them focus harder and be tighter with their control and repeatability. Hitters, on the other hand, have it too "easy" there. Its got to be difficult to adjust to the movement of pitches after leaving that environment. Based on the physics of baseball, a change-up will be less affected than most other pitches, although any tailing motion will be reduced. However since fastballs will 'rise' less and curves will drop less, both pitches will be closer in ending position to the change. The result is fewer swing and misses, and more centered up balls.