Ulf: You probably did not test the demo. It looks okay, not impressive but it has outdoor, some sci-fi indoors including a room with rotating and shadow-casting ventilator, swinging lamps (casting light and shadows dynamically) and a fantasy dungeon. There are alot of rooms, stairs even a portal leading to the terrain again. It heavily showcases the good scene management with portals and zones. It even has interactive panels where you can switch on / off ventilator or lights.
Better check it more deeply next time!

You said that you can do the same in A7. I am interested to see it. Really. We try it ourself and current scene-management is not suited for indoors. We have to write our own. The same counts for interactive panels, dynamic shadows and much more.
I am looking forward to your approach!

You want to see links to real games? Here they come:
http://www.terathon.com/wiki/index.php?title=Games

And here is a Galery:
http://www.terathon.com/wiki/index.php?title=Gallery
Check the video of "The Unknown". You will be amazed how good it looks, much much better than the official Demo.

The license is ok. I get updates for a lifetime. I can use standard license but I need commercial license if I publish through a big publisher. If I publish through small publishers or myself then there is no restriction at all.
Very simple and clear and very fair as well.

And yes, you are right. You can create levels with the demo. You dont need a license if you just use it without changing the source code. But nevertheless I bought it. So I get updates for a lifetime and I own a license. And I am sure it will become more expensive in the future when new improved versions come up.

Just look what amounts of features come up with every release in very short times:
http://www.terathon.com/c4engine/notes.php


Models, Textures and Games from Dexsoft