It is really awesome and much faster, although I still have to explore the details a bit further (never used e.g. "Activities"). I was surprised by the really cool login screen, then by the faceted search feature of dolphin, etc....
|Desktop and Dolphin|
I came to that point when I booted kubuntu on my desktop pc to upgrade it to Kubuntu 10.10 Maverick. When I clicked on the wifi icon, something totally different than on my laptop showed up. Have to admit I have been using Windows 7 on it for a while, but I was astonished how fast Kubuntu (still with old KDE) was. I thought that I might have missed something during the various dist-upgrades on my laptop and stumbled upon the great news. I first updated on my laptop(just add ppa:kubuntu-ppa/backports to your software sources via KPackageKit), which didn't make any effect on that network-manager tray icon, the old one was still there.
After some playing here and there I found out that knetworkmanager has been replaced by a package called plasma-widget-networkmanagement.
So I typed
sudo aptitude install plasma-widget-networkmanagement
I was asked to remove knetworkmanager and was a bit scared(no GUI for WiFi connections is not very nice) but I said "yes", installed and rebooted (of course plasma crashed :P).
|network management plasma widget|