I've only had it on 1 hour test hikes, but so far so good. Honestly it's hard to find a really bad pack from the major makers like Osprey, Gregory and Deuter, but they sure do make a wide variety. I needed a pack in the 30 to 40 L size range for a hut to hut walk. I walked around a couple of different stores with several different packs (with weight), and ultimately decided this Gregory Zulu 40 and the Osprey Stratos 36 carried the best and felt the most comfortable. Stratos may have carried just a bit better (with less adjustment), but ZuLu was in the same league and I preferred Zulu's softer, nicer shoulder straps, and some of its features, e.g., stuff pocket, rain cover location, top lid design. Also, the Zulu burnt orange is pretty snazzy!
This review was written in the old system and had content requirements that are different than reviews written today.