You're welcome iker

..and many thanks for your nice comments and also for downloading it.
Brett: Thank you!

i tried my best. Now the only real problem is to make my next materials better than this one.. ugh.
I know from my own tests that these materials are not that useful for any real renderings that most people do at home or at work, but they're hopefully useful for other people to learn from and to experiment with. Because of the high displacement precision value on almost all materials they're really slow to render even on a fast system. That's the sucky part, IF you wanna render these in a scene then you gotta tune down the displacement precision alot, to something like 64 or 32. That should render slightly faster with pretty good results even though you will loose finer displaced detail in the surface and the displacement will appear softer. It's still acceptable

..in worst case you can disable displacement completly.
/ Max