Well I am pretty new to Kubuntu but so far I have found it really easy to use. I have just recently switched over and have been documenting anything i find interesting about it on my site. http://www.pseudorant.com/
I Have been using the latest version of Kubuntu with KDE4 and it is great, detects all my hardware and runs it well. It has few problems though with KDE4 which is not fully stable yet, but still a very good edition of Ubuntu