The build quality seems top notch. I picked this up for my wife for christmas and as it is cold and snowy at the moment we haven't made it out yet. We stuffed the pack with blankets and pillows and got it fit properly. I opted for the 55 over the 65 and think that she will be happy with the size. She is 5'9, 130 and it seems good. She seems very happy with it and we are looking forward to getting out and enjoying some hikes soon. I know my packs and would recommend this item.
Thought it was a little small inside at first but then noticed the compression straps holding the sides in! Travelled in India for a month and found the pack ideal as it forced me to pack more conservatively. I may have gone for the next size up if I had known. Would liked to have seen the packs before having to make a choice but that was not possible as we live in Thailand.