I've been using the Dragonfly. Put it to the test with a hideous burden. Hiked out a moose on a walk in hunt making trips with quarters and gear from the kill site 2 miles from the truck. 2 miles aint much distance but its no small feat having made 4 trips to pack out a moose between 2 people and two packs all on foot in a no atv use area.
I had my Dragonfly and my dad was using a Alps aluminum frame with a hauler bucket on it. The Alps pack rode hard on the shoulders and the aluminum frame was a little more cumbersome in the alders. The Dragonfly slipped through brush easier and I could carry both meat and rifle out easy with the internal rifle scabbard. The Dragonfly, when properly fitted to your torso, rides more on the hips and not so much on the shoulders, making the heavy loads a little more bearable.
The Dragonfly will carry horns good but the aluminum frames seem to carry horns better. I found with the Eberlestocks, you have to get your load cinched in tight to keep the sway down and keep it stable and as long as you do that it works fine. Heaviest load I had in the Dragonfly was a moose hind quarter, 20+ pounds of backstrap and trimmings, spotting scope, binoculars, saws, knives and game bags. Sounds like a lot but you can make it work.
Last haul showed, all trimmings, neck roasts, tenderloins and backstrap in the dragonfly in this photo.