nostr:npub1jlrs53pkdfjnts29kveljul2sm0actt6n8dxrrzqcersttvcuv3qdjynqn and nostr:npub1xtscya34g58tk0z605fvr788k263gsu6cy9x0mhnm87echrgufzsevkk5s were talking about this on a recent Thank God for Nostr podcast. 

My takeaway was that it's very good but has serious scaling limits because of this.