I know it is working because a few years ago you would see an occasional buck that would score 110. Now last year alone I knew of 9 buck that would score higher then that. The deer have just been getting bigger and bigger. We harvesting deer that are commonly over 200 lbs. Which a few years ago it was rare to harveast a deer over 180. So its definitely safe to a say it isn't by dumb luck. QDM will work if done properly. The main thing is you got to give time for the buck to grow.