The title refers to the code-name of the latest version of Ubuntu Linux that was released late last month, also known as 9.10. I ran an upgrade on my system, after backing up, and it ran very smoothly. The 1.5GB of packages took about 20 minutes to download (bit faster than my old modem) and the install was all done in under an hour. The system restarted cleanly and all looked well.
The KDE apps look a little different and there are some new options for decorating the desktop. I don't bother as I'm always running full-screen apps. Amarok has been updated with improved podcast support. It's still not up to where the old V1.4 was before the re-write, but getting better. Kmail seems a bit more stable and less likely to stall when reading my inbox.
Gwibber seemed messed up, so I installed Choqok micro-blogger. It lacks there combined timeline, but is otherwise nice. I had to re-install MythTV, but it picked up the old settings and is working.
I still have problems with losing sound when multiple users are logged in. I seems to come back eventually, sometimes. The more serious, new, problems is random X Server crashes. I've seen this most when a third user logs in. Their session crashes with minimal messages in the log. I don't know if it's related, but I now see two sessions for each user when I run w, one for startkde and another for kwrited. I've not found any other references to this.
Overall I would rate this as a reasonable successful upgrade. The PC was not un-usable at any point, but the crashing sessions are a concern. I'll try and work out what might be causing it, but I'm not great at this sort of diagnosis.