I know Mr. Kelley and Yoda say any grip will work, overlap, interlock, or 10 finger.
I messed around with it today and it seems really easy to create a lot of leverage for the hit. I hit a ton of great shots. It seemed very easy to keep the right wrist bent and to really drive the #1 pp through the ball.
I'm curious if anyone has experimented with the 10-finger grip? What are the cons?