I am waiting anytime I do it before anyone else I always have an issue.

Installed just after it was released, working good with no problems.

Upgraded 3 servers over the weekend.  So far so good!

upgrade last Sat.

One user (EAS account) calendar from Sony Mobile is missing. need to re-sync.

Seems quite good so far. 

Im having difficulties.  1000+ users 35 domains ish.   Ram and processor utilization off the charts difference and Typical 1-2GB in mail disk space a day is now 50gb in a day. trying to track down whats up

Just following up with a quick update on Marc's scenario as I'm investigating it for him. While I am not positive yet that the build update isn't involved, the vast majority of the resource usage on Marc's server appears to be stemming from one particular user who has some corrupted GRP files present, as their email client is continually trying to re-sync that data.
 
We're getting more details and getting to the bottom of it now, but just wanted to get a follow-up posted here so we don't make anyone nervous unnecessarily. Thus far the other environments we've heard from have had excellent feedback and nothing crazy to report. I hope that helps!

We've updated two days ago. Until now nothing to report. Crossing fingers.