I'm running Kubuntu Gutsy Gibbon (7.10) on one of my main workstations. As with its sibling Ubuntu, it's an endlessly-entertaining blend of really nice stuff and really irritating stuff. The nice stuff is nearly-current releases of fast-moving applications like KDE, Digikam, Krita, KWord, and other apps that I use a lot, easy-on-the-eyes graphics, a good set of default applications, and nicely-organized menus. The irritating stuff is they still don't pay enough attention to delivering reliable basic functionality in core functions like networking and printing.