I have an Airport International. Great rolling case. I have been able to fit a pair of 1D-series bodies, and the three f/2.8 zooms, and a 300/2.8, plus lots of small accessories. (Not the stock hood for the 300, though -- I use a rollup fabric hood.) The locking features are useful, especially the locking cable, as I can keep gear locked inside the case cable-locked to a table or chair or something in a hotel room, media center, or airport. It's small enough that no one gives it a second look as a carryon, even though it's somewhat heavy when filled up. It looks like every other businessman's rollaboard. It's not large enough to fit all the camera gear plus a computer inside the case, except maybe an Macbook Air.
I also have an Airport Security, which is the larger carryon roller. It's huge in comparison, and I wouldn't want to try it on an international flight or on the smaller regional planes. But with the optional low divider set, it can carry a 17 inch MBP inside the case with all the gear.
Hope this helps.