Newguy mentioned 5 boards stronger and I would agree. I have thrown the Master on many different patterns from house to Mexico City and it is the strongest ball in my bag. Compared to the original Guru it just reads more in the midlane and it continues much better in my opinion. It is an amazing ball. I bowl in a sport lge at my home center and we put out Mexico City for 3 weeks. The 3rd week I had the Master and Mo happened to be there that week. I played deeper than I had the 2 prior weeks with the intention of burning a hole. It is a dbls lge so trying to blow a hole in the pattern takes some time. I hung in there for 3 games and then the 4th game I shot 250 something and if we would have kept bowling it would have been game on. The Master allowed me to play in close to where the higher rev guys play moving me away from 2nd arrow where you are flirting with a washout if you leak it right. Mo has been a tremendous help to me and our shop and I urge folks to book a lesson or attend his seminars when he is in your area. Mike Mineman.