"The UI hasn't change much since Red Hat 8.0, but Gnome 2.2 is included and things are a bit more refined and polished. Positive surprise would be the launch feedback you get when you load something from the Gnome Panel. Nautilus feels faster, the Red Hat menu is a bit more organized (no 'Extras' anymore!), the BlueCurve theme is as sharp and clean as ever and it has seen a clean-up/update in its looks...
"KDE 3.1 is also there, included, but it is not as refined as Gnome 2.2. Red Hat has put quite some weight on taking care of Gnome as this is their main environment, but KDE users should be satisfied as well, as KDE is present and works as expected, in my experience with the system..."