Visual aids are always helpful!  Thanks Rob (+5 to you buddy).  A few months ago we attempted to trend the releases of the CUCM appliance model versions (5.1 and later, 5.0 was a nightmare).  We were looking at minor releases (e.g. 8.0(2)), re-releases (e.g. 8.0(2b)) and service releases within a main-line release train (e.g. 8.0).  In some instance we saw very rapid re-releases.  I believe the 7.1(2) train was an example but I don't have my notes in front of me.  We found the average to be between 30 and 45 days, IF there was going to be a re-release or service update.

So, this has led to our general rule that we don't seriously consider a version FOR TESTING until it has been out between 30 - 45 days.  Ideally, 45 but some people are just impatient.  THEN, we commit to this version and test it out in the lab.  Even if another release comes on CCO we do not switch unless it is an absolutely critical fix.

So, I would not load 8.0 in a production environment.  Working with it in the lab is a good idea if you think you need/want some of the new features (like LDAP customization, integration with ADAM, SAF, IME, etc.).  If you have a lower environment then I would be a little more conservative simply because you don't want to drive yourself crazy and/or waste time.

HTH.

Regards,
Bill