I know that in general it might not be such a good idea to mix desktop environments. However I like both KDE and Unity and don't mind some extra applications. So I'm willing too accept the extra menu clutter in KDE. But there are a few concerns:

1. Both Kubuntu and Ubuntu use LightDM, should I expect some problems there? Which LightDM theme will be used by default?
2. Should I expect problems with some of the KDE services like Nepomuk and Akonadi when starting a Unity session?
3. Am I overlooking things, are there other known issues with this sort of setup?

Anyone of you who has both KDE and Unity installed and what are your experiences?