I have worked with RSCM-affiliated choirs and (especially) RSCM choir training materials for almost 30 years. Their greatest value to the Catholic world is definitely their choral curriculum 'Voice for Life'. It's the newest distillation of what originated as a training method for English/Anglican boychoirs. While the 'Life' part refers to the curriculum's expansion to include adult singers, the organization and its continuing focus are centered almost entirely on young choristers and the cultivation of musical excellence. Unfortunately, the materials have to be edited to remove various forms of 'inclusive' and 'expansive' liturgical language.

While there's a moderate amount of Catholic participation in the RSCM in Britain, including official Catholic representatives to the local chapters, it's an almost 100% Episcopal organization in the United States. As a result, the conferences, workshops, and festivals all assume that everyone involved is an Episcopalian and in full agreement with that body's current teachings. This makes these events inappropriate for young or otherwise impressionable Catholic singers--seeing ladies running around dressed as priests in beautiful gothic-revival church buildings, etc.

Buy the materials (GIA stocks them), perhaps attend a conference as an adult observer, and think of how Pueri Cantores and the Ward Method can come together to serve Catholic choirs as the RSCM does Anglican choirs.