Finally one that fits all ...
I have been eyeing the Osprey Xenon for probably a couple years before I finally decided to switch from my old pack over to Osprey. And the decision paid off! The first tour it accompanied me to Katmai National Park, southern Alaska and made the trip so much more enjoyable. On the ~18mile hike in to the base camp with roughly 80lbs on my back it was amazing how light and comfortable the load felt with the Xenon. For dayhikes I tried both the hood that converts into a fanny pack as well as the lightly packed backpack. It compresses really nicely due to the tons of straps on it, so that it even makes a comfortable daypack if you don't want to pack any extra weight. Because my old pack was extremely simple, no fancy zippers or straps, I was a bit overwhelmed by all the stuff going on around the Xenon, but once you got it figured out it actually all makes sense and has its purpose. So although a bit heavier than my older pack it is definitely worth the additional comfort especially with heavy loads.
Because Osprey has a very thought-through fitting system with special sized waist belt, shoulder harness and backpack size, I actually went to a nearby store for fitting it and then bought it at backcountry because it was way cheaper.