It offers a level of precision and "future-proofing" that standard alignment protractors lack. It uses a high-quality mirrored surface that allows you to align the stylus and cantilever directly by eliminating parallax error. This is twice as accurate as aligning the cartridge body alone.  Users and reviewers consistently report "shocking" improvements, including cleaner tracking, better instrument separation, and a "soundstage depth" that was previously hidden.