I've been running Ubuntu since a week or so before the launch and so far I'm quite happy with it. It feels mostly like Debian, which is what I was running before I moved to Fedora (for the better 32/64bit compatibility), but has a little more pace to it so far, plus a pretty significant surge of good will and interest. One thing I am a little disappointed in is that it seems the releases (in this case their first; warty) won't change much beyond security and important bug fixes. They are scheduled for every 6 months though. Personally I still think a rolling-stable approach to the desktop is going to be a killer feature if it happens. What will set Ubuntu's real course now they have a userbase will be the development of the next release, hoary. There are now quite a lot of people who are want to get involved and want to help. We just have to hope the process shapes itself well and a coherant way of working emerges and works well. My favorite things about it are really all things about GNOME, especially the automatic digital camera importing. It's fantastic to see the computer become more aware of what is happening to it and behave Correct™ly. My least favorite is really inherited from Debian - the 32bit compatibility on AMD64 machines isn't great. The good thing is that I can confidently append "yet" to that :)