Cyrus Imapd Experiences

[AJ]

Hello,
  I am about to rollout Cyrus imapd 2.2.4 for about 8-10k accounts.
I was just looking for any horror stories, sage advice before I begin.
I have been testing Cyrus in a semi-production environment now for several months, and all seems well.  My concerns are as follows:
- Has anyone had any problems with database corruption of any sort?  I will be using bdb 4.2.x.. If so, how did you solve it.
-  Any strange and odd errors or problems?

My environment is Red Hat Linux with about 4GB of ram and ample RAID 5 storage.

Thanks in advance.

AJ