Might be a good question on GolfWRX, as most of the shafts Titleist uses are commercial shafts used by custom fitters everywhere. Someone on that forum may find if any of this drifts down to shaft quality. I don't know if every lot is checked at the plant, but Titleist does test and approve any shaft before placing the option in their matrix. Titleist will take back any club under warranty if you have a problem with the quality to be rechecked. I'm comfortable that Titleist will stand by any product they sell.