I just attended the demo days at Sport Bowl in Sioux Falls and was looking for a ball to play on the fresh or on the longer sport or PBA shots.  I had the opportunity to demo the Pure Physics, Track 715T & 920T, and the Hammer Plague.  The Pure Physics was hand down for me the most versatile ball of the 4, I had the opportunity to throw it on both a THS and heavy oil shot.  On the THS I could really swing the ball while on the Heavy shot I could play from the 12 board to the 4 board and it made a smooth continuous move to the pocket.  I was so impressed that I ordered one, definitely will be trying this ball in league next Saturday evening.  

Mark