My girlfriend got me one of these for my birthday a couple months ago. It's way cool!
The hilarious thing is, when you start doing good and raising the ball up the tube, the voice of Yoda chimes in and says something like,
"Mmm Yes. The force is strong with you." Which of course totally breaks your concentration and the ball instantly plummets to the bottom lol. The first time I used it I didn't know it talked. I'm sitting there concentrating real hard with this big thing on my head and all of the sudden Yoda's voice comes out of nowhere telling me that "Calm my mind must be" - scared the heck out me LOL. I nearly died laughing.
So beyond having to concentrate on relaxing to try and hold the ball at a certain level, you have to learn to tune out Yoda and R2-D2 so they don't ruin your run lol. It's good fun
LD