11.2.0.2 Oracle Streams replication between multiple databases

Hello, 

I am currently on 10.2.0.4 streams replication (bi-directional) using two databases. 

I will be upgrading this environment to 11.2.0.2 and also plan to add two more databases. 

All 4 databases will act as source as well target - meaning there will be multi-directional replication. 

My OS is IBM AIX on 6.1 

If you have implemented such complicated environments, please let me know the experiences and how it is performing. 

My main concern is maintenance of conflict resolution on updates - using built-in update conflict handlers - do they function as expected? 

Also, can you elaborate on the implementation steps followed along with tips if any.