I am a member of the CPMS, I waited until Mister Dunn had a radar number available, so I was pleased with 1221, I also have radar in the CNA, 11111. Membership to various organizations is helpful as they all bring forth information and keeps one on top. Both outfits do a fine job, and along with the ONA are a must for serious numismatists. The cost is little for any of them, rules are few and far between. Sign up, most can be done by email.
Rick