I've owned quite a few black bladed knives, but I try to steer clear of them now. Some have been better than others. I prefer satin and stonewashed to anything else.
Here is my experience with black coated blades:
Benchmade: Holds up fairly decent. I'm not a Benchmade fan though, and one of the things (among many) that pissed me off is that they put a good coating on the blade, but don't bother to put anymore than put a thin layer of paint on the clip. You end up with a barely used knife with a clip that looks like its seen ten miles of bad road.
SOG: Their Titanium Nitride and Titanium Aluminum Nitride held up well. Better than Benchmade. I don't like their bead blasted finish at all though.
Kershaw/ZT: Their DLC is great, probably the best I've experienced.
Cold Steel: Worst of the worst. However, in upgrading the steel in their knives they've also upgraded to DLC.
ESEE: Fair at best.
Becker: Same as ESEE--comes off rather quickly.
I've come to enjoy the look of a well used satin blade over a black or tigerstriped one.