I installed LMDE Saturday on my test computer and then installed kde-full today. So far LMDE-KDE hasn't even given me a hiccup even after hammering it all day. My only complaint is that KDE 4.7.4 has the ghosting issue that has been fixed in 4.8.2.
It would be nice if it could be updated to the current.
Beyond that one issue I am happy with it..