I hope the Co-Pilot will come in more colors before long. I don't really need one now, but it seems like a great, uniquely sized bag that I could use for my everyday bag now and then when I want to carry a little netbook (or similarly-sized gadget) around.
I'd probably get one now, but I don't want it in any of the current colors. They are fine and neutral for business use, travel, etc. But I love TB largely for its olive-cayenne color combos, and I'd probably love for my Co-Pilot to have colors approaching the olive-cayenne. The bag looks to serve like a mini briefcase; I find it very uninspiring when my work bags have the standard black, blue, etc. colors.
I know the Co-Pilot's ballistic nylon only comes in limited colors for now, but I'm just hoping/wishing the color offerings will have more variety soon... :)