I upgraded a Kubuntu Hardy installation to Intrepid. Boy, what an eyecandy! It looks very nice, but it took me a while to get used to it. Since I'm trying to get a desktop that is easy to work with for people who are used to Windows, I can definitely say it's way too advanced for my taste.
It looks really nice, though. However, I already noticed some strange stuff. The Network Manager applet (or whatever they're called in KDE) just shut down when I tried connecting to my Wireless network. No message, nothing. No idea how to restart it.
So yeah, it looks nice, but it's not for me yet.