State of multi-master replication options

Hi All;

I suspect I know the answer to this...

What's the current state of multi-master replication for PostgreSQL? Is
Bucardo the only true master/master solution out there that might be
worthy of a production push?  Is Postres-R a candidate at this point (I
suspect not)? Are there any other master/master or preferably
multi-master (3+ masters) solutions available?

Thanks in advance...