The Advanced Lighting of T3D is very slow and the shadows are sometimes noisy.

-Slow lightening : i think in their videos , they uses big PC
with big configuration to make a fluid video
(For shadows , real time are always somewhat slow and always
not perfect even in AAA today games.)
- Pay again more for an extrenal lightampper
- Documentation is basic needed feature, just developping an
engine and selling it without good documentation: is like
doing half of the work !

Ok ; so improved , some teams will perhaps do something with it, but lot of things remain the same state finally !

Yeah , i know C4 is going strong, and the author is big 3D specialist !