Great!!! I got mine drilled up and bowled with it last night...It says the ball fits perfectly under the Cell and man does it ever.  I always had problems using my Cell on drier conditions and in the late 2nd and 3rd games.  This ball had a very similar shape to the Cell, not snappy like other balls, but not nearly as strong.  I threw my Cell the first game and a half, 5th frame of the second game threw the ball great and went a tad high, left a 8-10. I thought, this is what I got the Grand Illusion for, so I got it out.  I didn't move a board and threw the ball with the same speed and revs as I had been and buried the pocket. (Solid 10) moved a half board right and struck out...shot 259 my last game with it.  It was worth every penny!