It is sure enough one of the finest looking blocks I've seen.
It was posted about once before here, and if I recall right it performs better than a Maze 4 but not as well as a White Water or Cascade.
It shows a real attention to detail by the maker that goes far beyond what is most often seen. You might also be interested in a man's work who goes by the nick of Bladerunner, he's another maker of art works. His can be seen at a site called:
www.zerofanzone.com