I love my Speed 40 for week long trips in the Enchantments. It climbs so well with the swing arms. This is also a plus on steep trails/ginormous talus scrambles. Recently I tried one of my old backpacks again w fixed suspension and the "backpackers spaz lumbering of death" (where the backpack tilts strongly from side to side each time one of your hips sway with walking) reminded me again why suspension play is good for on trail, too.