We've used other mastering engineers and he just blew them away. Fans, radio stations, and even casual listeners to the album noticed the difference. Not only was the quality immaculate, but the sound was fresh and modern, and he simultaneously enhanced it as an artistic statement and made it rock way harder than any sissy-ass hurricane. Mastering makes a HUGE difference in the quality, and quite frankly, the marketability of your CD. Don't mess around with the amateurs; just go to Gary.