So my two cents is this... Stone Glacier, Kifaru, and Mystery Ranch are all worth their weight in gold and between them it comes down to preference and body type. THe MR packs dont fit some guys that well, but for me the MR fits my torso better than a Kifaru in my opinion. I would stay away from KUIU until the issues with their frame get worked out in the future.
I would say all were top end packs. In my opinion, the Kuiu problems are pretty overstated. I have over 100 miles on one, and haven't had trouble 1. I do prefer the SG and Kifaru to the Kuiu however. The MR was an awesome pack as well, and constructed as well as any of them.
However, the other packs are POUNDS lighter base pack weight than the MR. That is a big difference to many people.
I spent 11 days under the 2012 5000 kuiu with no break-in time. I got it two weeks before I left for my hunt. I had a 90 lb pack out on day 11 with zero problems and I've had many other days since the break-in trip. I have been happy with the comfort of the suspension. My only complaint is that the heavy pack out was not my kill; it was my brother's. For whatever it's worth...