Most importantly, there's no assurance of quality. For example, the clubheadsfrequently have air bubbles, the result of poor casting, that cause inconsistent shots. Just because the cheap head looks like the name-brand model doesn't mean it has the same precise weight distribution that corrects mishits. And cheap clubs usually use cheap shafts, which are prone to breakage and may not be the proper match for the head. For example, the pro may have his irons specially shaped for cosmetic reasons, playability, or feel.
Some pros have a favorite shaft, which they put in all their heads.
By the way, the balls are the same as what you'll find in golf shops. Applying lead tape to a clubhead is an easy way to increase swingweight or clubhead feel in irons and increase the stability of woods. You need only a little tape to noticeably change a club's feel. Send any questions about golf to Ron. If you would like to placed on our mailing list to receive monthly updates and news about the club , go here.