I've used Sena comms with Mesh for a few years, and have generally been pleased with their ability to link with other Sena and Sena Mesh units.
Historically, Sena and Cardo, the 2 leading brands, did not play well together. "Universal pairing" was wonky at best, and has been discontinued on Sena 50 series.
Late last year, Cardo issued software updates that permit any Cardo Bluetooth to connect with a Sena with Bluetooth (according to the internet). In addition, it appears to me that Cardos with bluetooth and DMC v2 mesh (like Edge and Neo) can bring in a DMC mesh group, and a Sena with Bluetooth and Mesh v2 can bring in a Sena Mesh group.
Q (finally): have any of you with Cardo communicators tried this? If not, would you like to test this? Seems like this could help with group communications on Club rides!