Currently using this. Haven't tested heavy scaling though because our app doesn't have huge scale needs. BUT, will say things are looking promising. Theres are some[1][2] improvements to replication and general speed landing/landed.

As far RxDB, in our limited tests, using only the query-sync feature speeds up everything a ton, not to mention optimistic updates. Overall it's been pretty great, and developer is very active.

[1] https://github.com/apache/couchdb/pull/495 [2] https://github.com/apache/couchdb/pull/470 [2]