I think an advantage of adjustable DW that a lot a folks don't take advantage of is in tuning. If you build your arrow for a 65# DW then you can adjust the DW up or down a pound or two to fine tune the bow and arrow for the best dynamic spine. All too often I see that guys have a 60 or 70 # bow and it is maxed out. It may be a little more efficient and quiet when maxed out but, with todays quiet bows and bow technology, a 70# bow that is set to 65#'s or a 60# bow that is set to 55# will be immensely quieter and more efficient than a bow of 5 yrs ago and those 5 yr old bows were quiet and efficient enough to kill a lot of deer.