Man I can't wait to read your views and its comparison with the Booq bag. I recently got a Booq Bag Boa M case (the messenger style) and I have really been thinking about a backpack now and Tom Bihn's been coming in frequently in my mind! So I can't wait to see what you say.
Right now I'm aiming for a vertical case and either a Brain Bag or a Smart Alec, just don't know which one I like!