The guys that have responded have pretty much said it all.
As rightly said above, DLC will wear DLC, so that in itself is enough to make me turn away - in fact that's why I avoid ANY surface coatings like the plague. I can imagine the little pressed parts of the flip-lock clasp wearing into the coating on the other part of the clasp pretty quickly, and that would irritate me. You only need to look at a PVD coated watch from a few years ago and they look appallingly tatty. Sure DLC is much tougher and will last much longer, but where parts touch each other (which on a bracelet is a lot of parts) it will show signs of wear.
The other thing to remember is that for all it's toughness DLC can and does get scratched as a couple of owners on here will testify, and as said above there's no real DIY repair option if you get a scratch. It's not a case of picking up the Cape Cods and polishing it out unfortunately.
Lastly, from what I've seen elsewhere where people have attempted an aftermarket DLC bracelet, there are problems getting an exact colour match. Unless it was spot-on it'd bother me a lot....... but then I'm quite anal like that.
However, if you really wanted to try this out, you could give a company called Backout Concept as go - http://www.blackoutconcept.com
Apparently their process is even tougher than DLC
and it's fully reversible, so if you hated it you could go back to the standard steel. Again, colour matching may be a problem, but the example watches they have on their site look damn cool. Not a clue about pricing though.
