Overall, this is a very good bookbag. It's quite roomy, and it really is quite comfortable when packed full - when you consider the added weight you're asking yourself to carry, that is. The reason I gave it only a 4 star rating for comfort is because it is possible to fill it to the point where carrying it is a chore. This is a good thing, though.
The small zippered pocket on the side is the PERFECT size for my TI-83 graphing calculator. The netted pocket on the other side is a wonderful place to put my wireless mouse.
However... I found by experience that this pocket is not a good place to put a 4-pack of AA batteries FOR that mouse. The corners of the cardboard ripped the netting, and made the pocket virtually useless. This is why I gave "Durability" only 3 star rating - yes, it's my fault it happened, but a 4 star bag wouldn't have failed in this way.
I am a little disappointed in the small zippered section in front (back??) (not the zippered pocket, the section immediately behind it). This is an excellent compartment to store pens. The problem is that it uses only one zipper, and - for me at least - does not always close 100%. As a result, I've lost more pens than I'd like.
One feature of this bag that I discovered by accident (and maybe it's become a standard feature in bags - I don't know, this is the first I've ever owned) is the velcro strap in the computer storage compartment. Before I found this, I almost lost my computer when the zipper opened itself (under the strain of being completely full) and, not being strapped in, the computer was a fraction of a second from falling out.
One section that I really love is the expandable clippered one. This is a great place for spiral notebooks. It can be opened very quickly and the notebook easily removed.
I am taking four courses this semester, and this bag is capable of holding all the textbooks, notebooks, sundry supplies such as pens, instant coffee, coffee cup along with my laptop.
If I were to change anything about this bag, I'd use additional reinforcement for the zipper - especially the computer compartment's zipper. The corner of my computer is causing noticeable wear to it after just 6 months.
All in all, this bag is one that I'd buy again.