I did use both Exadata and exalogic before. Before the deployment, think about the main purpose you want to leverage on this Optimal Platform.
- The price is very expensive and the solution/hardware locked to the specified hardware principals.(Normally at least 0.6 million USD without maintenance)
- Some features you may not need you have to pay license on it. Normally you have to get some skills on it before you can manage them properly : Solaris 11 Express/Oracle 11g RAC/Weblogic Cluster/ZFS SAN storage/NDMP backup experience/Proprietary system patch management...
- Out of the boxes, it is hard to integrate with the rest of solutions (backup/system monitoring/patches mgt/Firewall and security/Anti-Virus and ITSM system...)
- Normally, if you only have MS expertise and you will feel very hard to manage it. LDOMs/Solaris Containers/Oracle RAC/Clusterware/ZFS/Oracle Linux/Oracle VM/Solaris 11 and command lines....)