Bowler Stats:
18-19 mph
400-425 rpm
5-7 degree tilt
40-60 degree rotation
Layout: 45 degrees by 5" by 45 degrees
Initial thoughts: The Guru Mighty has some big shoes to fill if it's going to meet the glory that the original Guru has received. On paper and on video, the Mighty is supposed to have the same overall hook potential as the original but with more backend reaction. I used the same layout for the Mighty as I did my original for a true apples-to-apples comparison.
On the lanes: WHOA! I didn't think it was possible but the Mighty is every bit as strong as advertised. On two fresh house shots, I could play almost the exact same line with both the Mighty and the original. Thrown on the same line, the Mighty could push about a foot or so more before making its move to the pocket. However due to its stronger backend reaction due to the hybrid cover, the Mighty for me was actually a half to whole board stronger than the original due to the built-in friction of the house shot. The main difference that I see between the two balls is obviously the increased downlane motion of the Mighty which leads to being able to stay with the ball longer throughout the session. Where the original might be tempted to burn up a little early and leave a few weak 10s, the Mighty can still corner downlane enough to snap out those 10s. To put it into a little more perspective, I was able to play well inside of 4th arrow with the Mighty and I was sawing out 10s even with my low tilt (even after 4 games!).
On longer, heavier patterns, I believe the Mighty to be about a board weaker than the original due to the slighter read of the midlane. As the lane transitions, you'll see the Mighty catch up to the original in overall hook before potentially surpassing it.
Closing Remarks: I hesitate to make such a bold claim early on, but I tend to feel that the Mighty will become more popular than the original Guru. I say this due to the increased versatility and the ability to stay with the ball longer throughout the set while still maintaining a metric ton of hook potential. My Mighty remains next to my original Guru at the top of my bag. The two combine to give me maximum hook potential with varying shapes on the backend. Get one, or get beat by it!