I think the RCDD is a pretty respectable credential, since it's been around for so long, and it's been effectively the only credential in network infrastructure. Most of the RCDDs I know have generally known what they're talking about, though many are/were caught up on sticking to standards even when it makes more sense not to. Overall, though, good experiences.
Credentials like the ESS and RTPM, though, are pretty much only respected within the BICSI crowd, and I doubt they'll ever be more than that. They don't have the benefit of years of history like the RCDD. And there are credentials offered by organizations specific to security and project managment already, which candidates are more likely to work toward. It's not that I think there's no value in the education required to get them. They're just not the most valuable credentials I can think of.
Trafficware, a CUBIC Company
What does BISCI mean to me? I can check the box on the RFP response....
I take certifications with a grain a salt even though I have quite a few. Having references is far more important to find out how a company implements a project.