I tested the ASA short barrel bats, and put well over 1000 swings on the prototypes, and now I have close to 1000 swings in the KP23 ASA bat and there are no cracks what so ever. I have hit nothing but Hot Dots and Dudley HyCor .52 cor balls, in 30-40 degree weather, and been super pleased with performance and durability. It took about 200 swings for each bat to reach optimal performance, but have been very happy with how it matches up to the Monsta's, Demarini's, and Ghost.
If you hit anything other than a .52 cor ball, you will likely have spiral cracks, "shark-tooth" cracks, etc. These bats are specifically designed for the ASA .52/300, and not a Classic M, .44/375, or other ball. We tested those balls against these bats, and know how quickly they will break and fail at durability. If you hit only .52/300 or the .52/275, you won't be disappointed in the performance or durability.
Dan Bean
Precision/3rd Street/Bull Dawg