A quick update on my comparisons of the EXO4800 vs the 44Mag as I was able to find some time today to resume my trials. At the start of today the EXO had become my favorite based on tests done with loads 30-40 lbs and distances around 2-3 miles. The shoulder pads fit better, the adjustability was easy and the construction was clean and lightweight.
Today I put in 60 lbs and took each of them out for 1.5 miles of street walking. The change in weight changed my view on things. At this weight, based on the the fit and feel of the loads on ME, the Kifaru won by a wide margin.
With the EXO I experienced gradual belt slippage resulting in the load resting on my muscles rather than gripping my lower back and hips. This led to a hot spot and some early stage numbness that had to be address by load shifting. I had none of that with the 44Mag. It locked on to my lower back and hips and stayed there, making a more upright posture much more comfortable to maintain.
I need to test more - specifically on trail and at greater distances with another bump in weight - but unless there is another dramatic change then the Duplex Lite frame is going to stay.