Promos tended to be---but weren't always---early in the run of pressings. So better quality is a possibility.
Are Promo-DJ Copy stamped vinyl better?
I've always wondered if a record stamped "For Promo Only" or "DJ Copies - Not for Sale" were more likely first edition/early stamps. Most of the ones I've have sounded just fine but I was wondering what those of you who worked in the music, radio, and related industry might tell us about the pressings with these stamps.