I am sent a 60 page document each month to review before it goes to the printer. It is my task to make sure it is 100% print ready with no errors. Checking 60 pages worth of images for resultion, color mode etc with Adobe's built-in preflight is maddeningly slow to the point it is useless for me. This is soooo much faster and better than the built-in preflight. Many thanks to the developers... it was worth every penny and worked the second I installed it with no problems. It has saved my sanity and hours of work.