I made the plunge. I am now running Ubuntu 9.10 Karmic Koala on my main system, even though it is still beta. I had problems with my first attempt, but I downloaded the latest beta and I have had no problems. Being a podcaster I am so happy they finally straightened out the sound preferences. I also really like the Ubuntu Software Store. It makes browsing software a lot easier. The new version of Ubuntu also defaults to ext4 and grub2, though it is really not noticed. The artwork is better, but still brown – though dark brown. I like the changing desktop wallpaper. I give it an A. Still suggesting people hold off till the final release before upgrading.