I have turned from the Dark Side after installing Kubuntu on my primary machine. I am more than a bit blown away by this distro and by how much better KDE has gotten since I last used it. The new "system settings" control panel is fantastic.
Kubuntu provides a clean, integrated desktop experence with a nice selection of applicactions such as OpenOffice.org 2 (with KDE integration) and the Krita paint and graphics program from Koffice. Konqueror seems to be much more usable as a browser now (thanks to Apple's input, I suspect) and works fine with all of my web sites.
The install is simple and requires only one ISO. The applications cover the needs of most SOHO users (and me) without a lot of redundancy and mixing and matching.
Overall, Kubuntu is ready for use right out of the box with no need to futz around with it -- the default settings, theme and look and feel are perfectly acceptable.
I like it very much.