using Postgres with Sequoia

I am investigating data replication and failover ideas for a Java web
application. I would like the ability to have 2 or more Postgres
databases that are kept in synch, with the ability to loose all but 1
database and have the application still function. It seems that
Sequoia would work nicely for this. Was wondering if anyone here has
had difficulties using Sequoia and Postgres together.
Would also love to hear success stories about this strategy.
Thanks,
-M@