We have had some form or another of QDM on our place for about 5 years now and we are seeing little improvement. The soil isnt so go so the deer just dont get that big with a few exceptional bucks being taken (wonder what they would be with a good crop in the area!) In kansas where i hunt however the rancher has been doing it for 12 years and the deer are enormous up there. Lots of 5 year old deer being taken on that place, most way over 150"