I picked up a Gregory Paragon 58 last year, which I've used a few times now and is overall similar. By far the most comfortable pack I've carried, and some of the little features are really good, as is the build quality as you say.
It recently carried about 30kg into Lochivaon bothy, well over its 23kg "max carry weight", with no problems other than my knees! The floating lid is well designed and allowed me to strap a 25 litre dry bag on top of the pack to extend its capacity for whisky and coal. The various attachment points also made strapping a guitar to the back easy, I'm sure something the designers included in their planning.