I made a map in UDK with my own textures and models for testing (as well as in other engines):
http://www.youtube.com/watch?v=dQqkkeRBAb0

Actually it is a great technology. The interface differs from others so it needs some getting used to. In the end it is very powerful and the latest version even comes with DX11 features.

Models, Textures and Games from Dexsoft