If you are in a hot area like vegas they will crack left and right, expanding and contracting will kill drilled balls off.
Never had an undrilled ball crack yet, have watched 3-4 balls crack in half on a drill press being punched though. Ebonite Black Matrix was two of them back in the day.
Also never had a legends or Brunswick ball crack yet, every other would be a big yes with one unnamed brand here going upwards of 50 balls now. Since they always replace I will be nice and not slam them, still buy there stuff because they back it up.