Got mine just a few days ago. I loaded it up with my MO gear and a fully loaded rifle and went for a two mile walk the first time I put it on. It road very well and I was very pleased with it. With the gun riding as low as possible, I could still get it out of the pack yet it was invisible to anyone that saw me walking.
The guys at work liked it so much we are ordering 5 hopefully first of next week.
One thing I have to add is I did not serve in the military and have only worn a ruck/pack on 4 occassions so my experience with packs is limited. That said it was extremely comfortable, although with gun and load, it was only 30 pounds. I anticipate adding another 10-15 pounds as I figure out what else I may need.
I really like that it is very narrow compared to a military ruck or other packs I have played with. It fits well within the confines of your back and I don't feel like the Pillsbury dough boy with it on. One of the smaller guys at work, 5'8 150, tried it on and it still fit nicely within his frame.
HTH.