I bought this pack almost a year ago and have used it for snowshoeing, climbing, hiking, fishing, and had it as my daily pack at an outdoor camp I worked at for several months.
Pros: I've never had any trouble fitting extra layers or other necessities into this pack along with all of my gear for the day. It moves very well with your body even if you're twisting or reaching up and around for something. Its slim profile doesn't inhibit your balance as your hiking, climbing, etc. There are enough pockets to stash your random objects in, but not so many that you forget where you put your stuff.
Cons: You can only access the main compartment from the top. This means that you really have to think about how your packing everything in or just deal with sifting through everything on top to get down to the gear on the bottom.