I had the pleasure of working with Mo Pinel last week here in MN. He laid out a Guru for me and had it drilled 30x4-1/4x25 P3 balance hole. I rarely have room to miss to the right due to my being speed dominant, but this Guru is something special. I made a big move left of where I was throwing my Mastermind and actually had to swing it (I typically am down and in). The Guru gave me entry angle I don't usually get.
I tried it on league night, wood lanes, didn't work out too well. Strong balls with dull covers tend to burn up. BUT, I didn't buy it for league night. The true test will be at the year end ABT tournament this weekend and at State.