Very much improved over the last time I tried, there were two things that I particularly liked about this version:

• Running the script to install the VirtualBox Guest Additions, was all what was needed to get the additions working, no need for manual configuration of the screen drivers. (This is imoportant because one of the reasons I’m not in Kubuntu is the bad support for screen and monitors, because I constantly switch my laptop from single monitor to dual head, or add a projector)
• OpenOffice.org
  

  Oxygen Style in OpenOffice.org calc

  has complete KDE4 integration, so It finally looks nice inside KDE (Very important: calc is the application I use most).

The new packaging system packagekit, was not really usable the last time I tried, it seems to be doing all right now.

It’s very possible that with the release of Karmic, I’ll be back in KDE