i played with one a few weeks ago, and as a keeper, it just fucks with you for fun. You'll be trying to save a freekick, and going through what you always do. Spot the ball, track it's spin/direction, then move towards where its going and get ready to grab it. Only the problem with the jabulani is that you see it, you figure out the direction, and then when you're moving to grab it....it's suddenly veered off in the opposite direction. (or it's suddenly diving, rising, etc.) Its just not predictable. For the strikers i was playing with it was more love/hate. It goes right where they want it, it curls into a better position, or it blasts 100ft off target. Personally i'm not a big fan of the pattern on it either, it's not particular easy to read. The teamgeist is probably the best ball i've ever played with.