Routing Registries...

What are most large NSP's doing in the way of routing registries? Is most everyone using the RADB or a local database? I'm working on some guide-lines here. To me, using the RADB seems the best idea, but others have mentioned a requirement that it be kept in-house and just exported on a regular basis. Any thoughts? I'll summarize private responses, --Ben Kirkpatrick, ELI DPG