This backpack is great!  I am an electronics engineer, and I needed a pack that could carry my laptop, notepad, tools, and cables.  This pack does all of that.

Things I like:
1.  Nice big laptop compartment.  The compartment on the back holds my (14" x 10.5" x 1.5") laptop nicely.  I also like that the laptop compartment is underneath the shoulder straps, so if the pack is on your back, no one can tamper with your laptop.
2.  Plenty of compartments.  I have my laptop in one compartment, my tools and notebook in the next compartment, and my cables in a 3rd compartment.  And I still have room to store my keys, phone, and water bottle.
3.  Comfortable.  I sometimes spend most of my day walking around with the pack on my back, and it is very comfortable even when filled with tools/laptop/etc.

Things I would change:
1.  The material it is made of.  The material is fine on top, but the bottom of the pack is just cloth.  Because I work in industrial environments, it would be nice to have some sort of rubber lined bottom so I don't have to worry about what I may be setting it down in.

Overall, I really like this pack and it works great!