I have a Kifaru Mountain Warrior. It has worked very well for me aand has stood up extremely well to some harsh use. Biggest concerns are: 1) it is heavy, roughly 8 pounds empty, 2) it isn't water proof and not all that water resistant so if the snow/rain is heavy, I have to put on a rain cover. Not a big deal but it just takes a little more time/effort, 3) the pack feels like it is riding too low sometimes even when I have the belt positioned correctly on my hips. Usually when I am carrying a very heavy load. Maybe a different lumbar pad design would help that, I don't know. Being able to mount added bags via the molle webbing is a huge plus. I have my spotting scope and tripod in a side-mounted bag so moving place to place is very easy. And with food in the outside pocket and a side-mounted water bottle carrier on the belt, I rarely need to access the main compartment unless I am changing layers. I also really like the gun-carry system for hiking into and out of locations where I am pretty sure a quick shot isn't going to be needed.