Hi Fellow Bowlers - This is a great subject! Good ideas and easy reading. I bowl at four centers, all synthetic, with differing oil patterns and lane Topographies. Makes for an interesting game plan preparation. I enjoy the analysis! Background - I am 81 years young and love my bowling. Average in the low 190's. In my pursuit to become a Gold Level Coach, I volunteered to work at a high end pro shop. I worked with and mixed with many PBA players. I learned to drill my own equipment, 70 plus balls. I became a specialist in the Dual Angle Drilling Concept. I really like the DA concept. Now I purchase a ball take it home, in the box, layout the DA and take the ball back to my Pro Shop guy and have him drill the ball to my specified DA layout. A great arrangement for me. Back to your question - I watch my teammates and competitors at all 4 centers and tournaments. If I see the high end players using a ball, I place it in my study brain. I read all of the Ball Reviews articles and Bowling This Month. I review the Cover Stock, Core, RG, Differential, and Intermediate Differential data. I am particularly interested in the RG value. Low, medium, high RG tells me a story on arsenal fit. I was fortunate to attend a World International Coaching Conference in Arlington, Texas. Chris Barnes made a presentation on RG! WOW! BTM provides a meaningful review. BR is a big contributor, I enjoy other bowlers discussions. It is surprising, out side of you guys, how many bowlers do not have a clue! But you need your own plan! Strikes and Spares - Gold Coach ABE Denny O'Neill