4.4 is the version shipped with Debian Squeeze. It is my only experience of KDE4 and it was still flaky at the .4 release.
Out of the box I found the user experience painful and even after using it for a couple of months I never managed to configure it to be anywhere near as usable as KDE3.5, so I got rid of it.
I now have one desktop running Linux Mint and my other desktop is running Trinity desktop Environment. If Mint goes to GNOME 3 I will try GNOME 3, but I expect I will eventually run Trinity on both boxes.