Just got my Empire Builder and love it, however after a few days of use there are 2 things that could make it better IMO.
1) Smooth back so that it won't abrade my work clothes when I'm running to catch a flight
2) Some of the very cool pockets under the flap could use a flap or some kind of retainer themselves.
My iPod/headphones/charger/iTrip went rattling into the flap pocket after the bag got inverted during a little emergency stop incident on my way back from the office.
Overall, this is the best professional bag I've ever owned. Kudos.