I just installed 4.0b KDE into a VirtualBox VM. Everything seems to be working well. Open Office says it is crashing when I close it, but other than that seems to be running like a top.
How do you enable Compiz? I remember in 3.1 Gnome all I had to do was click on Beryl in the menu and it work out of the box. is the 4.0b KDE eye candy ready?