Re: I bit the bullet yesterday
I do. In an attempt to become a "one OS shop" (sadly still saddled with a few M$ boxes, but what can you do?) We're running 12.04 on 95% of our servers as well as about 400 of our desktops. It's been good, for the most part, and this looks like a move in the right direction.
The desktops have been fine, but the server end is where we've had problems, and it's actually nice to see them putting more effort into it. Up until now everyone has just said "You should use Debian"... they're not totally wrong, but again - one OS shop.
Puppet is a very welcome upgrade, since we're using that already so better support will be nice, and I've been playing with Ceph on 12.04 and not having a great deal of success with it, so that'll be interesting to try. Could potentially make a serious difference to our storage architecture if that works out.
I'll be throwing this at some test boxes as soon as it's released, then we'll have to do some long term testing and consult the users to decide if we're going to go with unity for the desktop. Seems likely we'll repackage with xfce again, and leave unity as a non default option like we did last time.