We do not want to upgrade to version 6 because we heard that there are still some instability issues and hope to wait for it to be stabilized first, at least with more bug fixes done.
And since we do not really need any of the new features found on version 6, so this make it un-necessary to upgrade, consider the downtime period and the potential risk of misconfiguration during the upgrade process.
But we do have plenty of important features we have requested but have not been implemented yet. If these more important features (at least some if not all) are implemented in the next release, then it will be worthwhile to upgrade.
