Targus 15.4" Matrix Backpack Opinions Sought

Good afternoon...I've run into a pickle and need opinions on this bag only.

My situation:
I currently have an HP ZV6000 that I will be taking to school with me. I have five classes that I will be taking with no option of a break in between classes to run to my car to swap out books and a folder notebook (I'm in class from 8-3:15 straight).

My dilemma:
I currently have the Targus Chicago backpack which works great as a travel bag for the laptop and accessories only. I've tried putting a few books in there and it just isn't happening. Great bag but I don't want to beat it up w/ books.

I also have the Targus Los Angeles messenger bag which works great as a quick transfer between places in-town when the backpack isn't required to have all the accessories.

I am looking for a bookbag that will house the laptop, plus books for ALL my classes and probably one binder w/ folders of written notes including a spare battery to carry with me all day long.

My Solution?
I found this bag: http://www.targus.com/us/product_details.asp?sku=RG0322. It looks big, the reviews are saying it's huge, just wanted to know if you can fit in there what I need...they say it expands as you add stuff which is exactly how my Chicago works, but just doesn't have that extra compartment I need.

My Question For Users:
How do you like this bag?

(I hope this e-mail was laid out good enough to understand).