I've used this pack for one ride so far. Definitely a keeper! Was comfortable to wear and also had enough space inside for other items that you might need on a ride.
Only a couple of issues for me. For my size (5'8"), it does cover the tops of my jersey pockets. But that doesn't mean I can't put stuff in my pockets. Only means that I would be difficult to get to them wearing the pack. Might not be a problem to taller riders. I would also suggest to Osprey that they increase the power or strength of the magnet for the hose. I does pop off the magnetic keeper if my arm touches the hose.
From my 10 year old son: "This backpack is the most convenient out of other products I've used. The bladder can hold lots of water and is very easy to fill up and clean. It has lots of room for snacks and other needs. I would strongly recommend this product."