Awesome bag! I tote this around the city, on dayhikes, overnights, and, if the weight is spread around, on ultralight 2-3 days (it's possible). The pack rides beautifully and the airspeed suspension is terrific. In fact, the suspension system on this bag sent me off into full on conversion to Osprey for all my packs. I've yet to experience anything beyond minimal sweating on my back, owing entirely to how well air glides through the suspension system.
The included rain-cover is a fantastic bonus and a feature which I would love to see on some larger packs (as opposed to buying standalone covers that can, and will, be forgotten).
My one minor ding on the bag is that the airspeed suspension makes for a slightly awkwardly shaped panel where large objects (such as some laptops, if used for school) might not fit easily. To me, the benefits of the airspeed far outweigh this minor drawback.