Bike Backpacks - Thoughts and Help

Help me?

I am needing to get a new backpack for my 20+ miles urban bike commute. I carry a macbook pro with me most days and would really love one with reflective elements.

The Welded Postbag from Chrome has quite a bit of style: industrial feeling hardware, water resistant material.

The Ortlieb Velocity Cycling Backpack has bright reflective details. Love the top handle too. 

The Timbuk2 Phoenix Cycling Backpack has a lot of storage details, side access panel. Might be particularly good for airport travel too. 

I would love your thoughts, if you've ever seen, used or bought any of these. I trust you and your wisdom. Help me out.