Jim Callahan

"I use Tenpin Toolkit at PBA level and as a coach. The lane play portion is fantastic, with the ability to show getting the ball right quickly which is crucial on the PBA Tour. 

The observation trainer is really good for helping players watch the ball go off the deck and determining dominant eye to help alignment.

One of the best $9.99 I have ever spent and the most realistic app in the world for what I am doing."