This bag is pretty good, there's some things I really like and some I don't like so much.
I really like the expandable external pouch, I generally toss my shoes in there on the drive to the trail. The helmet keeper is awesome, and is the best method I've seen for carrying a helmet. The magnetic keeper for the bladder is also my favorite method of retaining a bladder hose. My favorite part is the tool roll in its own pocket in the bottom. It easily stores multi tools, patches, a pump, and whatever else you may need for your ride.
The internal storage compartment isn't the best, mostly because the zipper is on one side and is very stiff which makes it awkward to get into. Having said that, I can easily store a small first aid kit, shock pump and a light layer in there for a ride.
The osprey bladder's treatment does a great job at preventing it from getting funky if you forget to clean it. Most camelbak bladders would be green after a few days. However, I prefer the camelbak bite valve over the osprey.
All things considered, this is a great pack for the trail. If you don't need a ton of storage but want a great way to carry your tools, a few odds and ends plus your water; then this is the pack for you!