I think if you can get in a climber early and be quiet you have a much better chance at sucess with a mature buck, to me the only productive way to use a ground blind is to set it up way early and brush it out giving the deer time to get used to it, chances are if you go set up your ground blind today at 2:00 then hunt the rest of the day if your in a spot the deer uses all the time he will notice something is not right and look your blind over as soon as he spots it(usually he wins the staring contest and saves his owen butt! I think a climber is much more effiecient as far as killing especially old deer