I, too, love my Co-Pilot black/iberian. It and my Little Swift cacao ultrasuede are my regular go-to-work bags. Occasionally, I may need to carry more than my usual load, then I use my Imago steel/cork/wasabi or Swift cork.
I do not carry a laptop, mac, ipad or tablet to work. Still, I wished my Co-Pilot was a little longer & a little taller. I do understand that my primary use of it is NOT what it was designed for - personal carry-on bag for airline travel.
If I had to use a briefcase for work, I like the larger cadet, to be able to carry legal size folders. I do not need a briefcase in my job, so I am content admiring the Cadets & reading about how owners use them. But if Tom Bihn & crew made them in black/ultraviolet combo, I will buy one just because.