I have one of the non-computer models that I converted myself to hold my MBA, brick, notebook (paper) and everything else I needed when traveling. I could gripe about it all day, but there is not much else that fits with a "corporate" persona that protects better. They do get dinged up, but at least the machine stays happy...
When it is up to me, my computers all go in OtterBoxes, but there are places where you cannot show up looking like you are in some special forces unit.
If you end up getting one, I would highly recommend the "gunmetal" color. I was given my first Zero case, and did not like that it attracted a lot of attention. Since I switched to the gunmetal one I have not heard a peep.
If it is not for work, get an OtterBox instead.
There is plenty of room for accessories in the 5" padded ones since the MBP is a lot thinner than many competing 15"s, just secure it so the computer is not slamming against it.