There are still some rough edges, but it mostly works really well.

It is highly configurable, Dolphin is the best file manager there is on any OS, everything works seamlessly over sftp (Dolphin, Kate, etc) without the disconnections I used to get from GTK apps. KDevelop is pretty good now, and so are a lot of other KDE apps. It looks great and the desktop effects are nice.

Biggest problems: both ssh connected: it cannot recognise keys created by recent versions of ssh, so you have to remove those keys from known_hosts, and it does not seem to work properly with ssh-agent to store passphrases in memory for the session.